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CANINE WOBBLERS SYNDROME

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Wobbler Syndrome (cervical spondylopathy) - The displacement of one vertebra in relation to another.  It is caused by an instability and often an abnormal shape of the vertebrae of the spine, causing pressure on the spinal cord.  Sometimes the discs between the vertebrae are involved as well.  It leads to pain in the neck and an inability of the spinal cord to function properly.  As one of the main functions of the spinal cord is to transfer messages from the brain to the peripheral nerves in the body and back, this leads to a breakdown in this nervous communication.  This often leads to incoordination when walking, especially evident in the hind legs, which is why the condition is called wobbler syndrome.  In some cases it can cause total paralysis, especially if there is an associated prolapse of an inter vertebral disc.

The diagnosis is made on a combination of the history, a clinical examination of the patient, and further examinations, usually in the form of x-rays. Often this involves contrast studies, such as myelography or an MRI scan.

Treatment can be in the form of medication or surgery. Medication is often used initially, together with exercise control. Drugs used include anti-inflammatory drugs and other pain killers. Surgery is indicated if the symptoms are severe, if there is paralysis or an associated disc prolapse, or if medication alone is not enough to relieve the symptoms. Several surgical techniques are used. One of them reduces the pressure on the spinal cord by slightly pulling the affected vertebrae apart and placing a ‘washer’ in between them. Surgery is often, but not always, successful. If paralysis was present before surgery, the outcome may not be as good.

This disease affects dogs of all breeds.

Wobblers Syndrome
What is Cervical Vertebral Instability
A Wobblers Tale

WOBBLER SYNDROME

by Fred Lanting
Description
There is a disorder (it may actually be two) in the canine similar to the “wobbles” in thoroughbred horses. Much has been written on this, with various descriptions such as cervical vertebral instability (CVI), cervical spondylopathy, stenosis of the cervical vertebral canal, and even the mouthful, caudal cervical vertebral malformation- malarticulation. It was once referred to (incorrectly) as spondylolisthesis. However, no term is more used, more succinct, more descriptive, or even perhaps more accurate than “wobbler syndrome”. In the horse, about 12% of this syndrome can be blamed on osteochondrosis and here, too, there may be some parallels with the dog.

That we may be dealing with two very similar disorders or two variations of a disorder is indicated by the differences seen in early studies on Doberman Pinschers and Basset Hounds and later work with Great Danes. The earlier work pointed at instability, subluxation of the vertebrae, and a tendency for one of the vertebral bodies (the actual bone segments of the spine, not including the material between) to lose bone, ride up onto the one in front of it, and thus compress the spinal cord from the bottom. This would be a little like a car with an angled bumper running into another car ahead of it, its front bumper sliding up and over the rear bumper of the other vehicle and smashing into its trunk and taillights, although in slow motion. Mostly large breeds have been involved such as those named above plus Saints, Old English Sheepdogs, and Rhodesian Ridgebacks, though infrequently in smaller breeds, also.

Stenosis is a squeezing or partial closing of a tubular structure such as an artery, heart arch, or, as in this context, the spinal canal (where the spinal cord runs through the vertebrae). It is congenital (found at birth), developmental (gets worse), and degenerative (has destructive effects) in man and probably so in dogs as well. Stenosis has been seen in the cervical and lumbar vertebral canal and the intervertebral foramina (spaces between the vertebrae), and may be “silent” not giving rise to complaint, in many individuals unless accompanied by other factors such as protrusion of a disk, spinal instability, or movement such as the extreme flexion or extension of the neck or other part of the spine.

Most of the lesions in early studies were between the sixth and seventh cervical (neck) vertebrae, which are designated C6 and C7. It has been thought that there was an inherited malformation of these spinal segments (vertebrae) with possibly a simple recessive trait but more recent evidence indicates more genes are involved in ways that are somewhat more complex. We know a little more about osteochondrosis and the etiology of osteophyte formation now.

Clinical Signs
At the point of greatest cord compression, the damaged ascending sensory neurons (those nerve cell carrying electrical impulses to the brain) begin to die. Their myelin sheaths deteriorate, and confusing impulses cross over from one axon to another, in effect making the brain and cord “think” they are coming from someplace else, and thus the return messages to contract certain muscle fibers may be sent to some of the wrong places. This gives rise to much of the missteps and poor movement. Many of the axons (main conductors) also die, and loss of sensation results.

Simultaneously, descending motor neurons are affected the same way, so fewer of them function from that part back to the muscles. Therefore, the dog may seem not to know where its limbs are, drags its toes in a manner similar to those with GSD myelopathy or stands on the top surface of one of its rear paws, has poor coordination especially in the pelvic limbs, may stand wide and, if the thoracic limbs are affected, may have a prancing gait. In severe cases, the dog falls down easily and has a hard time getting up on its feet. The syndrome affects both sides of the body equally.

The descriptive terms “ataxia” and “spastic paresis” in this disorder refer to weakness and partial paralysis with uncoordinated motion, and these are seen principally in the rear. When cervical spinal cord damage is further toward the head, the forelimbs and even perhaps the diaphragm may be involved, but in canine Wobblers, the lesion is usually found in the caudal (rearmost) vertebral spaces such as C6-7, rarely C5-6, although in Basset Hounds the same or a similar syndrome is associated with the cord pinching occurring around C2-3. Wherever it exists, it may cause an abducted (limbs move away from each other) and sometimes a fast-beat gait with stumbling especially when turning. The ataxia, of course, is due to the damage to the ascending neurons and the jerky movement and paresis to damage to the descending neurons, both at the point of cord compression.

Cause
It was discovered very early in man and described in the dog by 1967 that vertebral canal stenosis is a cause of spinal cord compression and these researchers considered deformation of the vertebral bodies to be the cause of that stenosis. Others have looked at this and similar problems in a variety of breeds.

About the same time as the above work and a little later, another cause of spinal canal stenosis was proposed: a deformation of the vertebral arches (that part of the segments covering the canal), as well as the disks, the processes, and articulations in the joints between the bone segments. Other things happening at the same time and possibly contributing to stenosis or associated with it otherwise include hypertrophy (overgrowth or thickening) of the flavum ligament or of the dorsal longitudinal ligament or of the dorsal annulus. Simple poor alignment and malarticulation have also been blamed or implicated. Another cause of compression of the cord is the CVI (cervical vertebral instability) mentioned earlier, and identified by various names such as spondylolisthesis and vertebral subluxation.

In the earlier work on CVI, instability was the diagnosis when greater flexion between two vertebrae than “normal” was evident. When we speak of flexion, we mean the bending of joints so that the limb or extremity is “folded” toward the centerline of the torso, while extension is a straightening-out away from the rest of the body. In speaking of the neck, flexion is the bending of the head downward toward the sternum, and extension is the bending up as if stretching to reach over the back. How valid is the diagnosis of neck instability as “shown” in flexion, was brought into question in 1977 by Wright who found the abnormal angulation (one bone starting to slip or ride up on another) in many dogs who had no clinical signs of cervical spinal problems. It had been standard practice to bend the neck down fully and see if there were any irregularities or subluxation on the radiograph. These pictures were compared to the neck in a neutral position (same as it would be carried in standing). These pictures were almost invariably taken in a lateral view (from the “side”, with the dog in lateral recumbency), although some people showed how useful a ventrodorsal view could be in demonstrating lateral compression of the cord.

In 1982 Olsson, Stavenborn, and Hoppe in Sweden studied Great Danes and found that the ones with wobbler syndrome had radiographically demonstrable lesions only when the neck was in extension, which ran counter to the experiences previously reported. They did not find any CVI or vertebral body deformation, except for a slight deformation in the vertebrae of one dog, and guessed at a number of possible reasons. Their work was only with Great Danes, and previous studies had also included Bassets and Dobes, so perhaps there is a different genetic pathway for some breeds than for others. The syndrome in Danes occurs mostly in young dogs and in Dobes they occur mainly in older dogs. The 1982 Swedish study involved “wobbler” dogs from 4½ to 24 months. Both plain radiographs and some made after the injection of a dye for myelography were studied, with the necks in all positions. The euthanized dogs’ spinal systems were then studied for comparison.

Even normal Danes have relatively smaller ventrodorsal height to the spinal canal, and larger prominent intervertebral joints compared to many other breeds. When they looked at a dog without wobbler signs and increased C3-4 flexion as seen on a regular film, the myelogram did not indicate any pinching of the cord, even though it looked as if the bone could have done so. The wobbler dogs with increased flexion between two vertebrae showed no pinching, either. The picture that came out of this work in Sweden is that compression of the cord is most severe when the neck is extended. It also appeared that the compression and stenosis took place at the cranial end of the vertebral canal, where the height was less and the “roof” was pushed down onto the cord when the neck was lifted (extended). This is probably why many wobblers will hold their heads down, by the way, but that is not the best diagnostic sign. Often, Danes with wobbler syndrome have an abnormal vertebral arch (between the “neckbones”) that is plump and longer, and frequently it is seen in association with deformed and asymmetrical articular processes. Many also have considerable osteophytic deposits that may contribute to further compression. Compression was more dynamic than static, meaning other forces combined with the malformation to produce the compression, such as disk protrusion and even the normal movement of the head and neck. Possibly the most important finding of this research, beyond the hint of breed and genetic differences, is that cord pinching might not be demonstrated in wobblers unless myelography is used in conjunction with radiography and pictures are taken with the neck in different positions.

The breeder/owner can make a tentative diagnosis based on symptoms before taking the dog in for myelograms. However, you want to remember that there are other problems, and you should differentiate between them. Part of that diagnostic guess may be influenced by what breed you have, as Wobbler is more likely in Dobes while myelopathy is more common in GSDs, for example. If the dog has no pain, but the unstable gait described, it is very possibly wobbler syndrome. If pain and hypersensitivity are present, your dog may instead have cervical disk protrusion syndrome. The pain probably comes more from the secondary inflammation that results when the disk’s nucleus pulposus tissue extrudes into the epidural space in the canal and calcifies with this “hardened cement-like” material acting much the way osteophytes do in irritating and abrading the surrounding soft tissues. In the wobbler, inflammation is not much of a problem if at all.

In the important 1974 work at Cornell on Great Danes, joint problems, and nutrition, evidence indicated that vertebral body deformation is a manifestation of osteochondrosis brought on by rapid growth and overnutrition. Olsson and colleagues commented that some of the changes seen in the cartilage between the vertebrae have similarities to osteochondritic changes seen in other joints, and implies that high-energy, high-calorie “rich” diets may, in certain dogs and breeds genetically predisposed to these disorders, bring on the osteochondrosis responsible for the stenotic myelopathy (pinching and disease of the spinal cord) seen in animals.

Other environmental factors may worsen a congenital or hereditary problem. It has been theorized that the very heavy head of a thoroughbred horse, a Great Dane, or a Basset Hound put great stress on certain vertebrae during early growth, but there are too many questions to give much credence to that. Dobes certainly do not have heavy heads, and different vertebrae are involved in different breeds. Separate genes and locations may be involved in Bassets compared to other breeds. A cooperative pedigree and clinical study program between breeders and some veterinary school teams could provide more accuracy in detection and improve some breeds of dogs through prevention of disease.

Treatment of Wobbler Syndrome
Earlier treatments have included fusion of adjacent vertebrae with bone grafts and bone cements, or simply the use of anti-inflammatory drugs, but improvements were needed. A technique developed at the U. of TN in 1983 calls for drilling a slot between the two segments and filling the gap with about ½ to 1-inch of bone cut from the pelvis. What makes it different is the use of stainless alloy rods with hooked ends attached to other vertebrae, and a threaded section with nuts that can be tightened to adjust tension. About 75% of the dogs treated this way at the U. of Florida vet school regain at least partial use of their legs, a much better prognosis than has previously been had. Fewer dogs now face euthanasia.

ATLANTO-AXIAL SUBLUXATION
This is another spinal cord problem with much similarity to Wobbler Syndrome. Indeed, it may be only a matter of location on the spine, determined by breed differences, that causes this to be considered a different disorder. The first two neck vertebrae are called, respectively, the Atlantis and the Axis. The articulation between the skull and the Atlantis has been referred to as the “no” joint, while the Atlanto-axial articulation is the “yes” joint, which is all the description anyone needs to understand the range of motion there. (I can see you nodding and turning right now!) In illustrations and journalistic shorthand, these vertebrae will often be referred to as C1 and C2.

Most common in toy and miniature breeds, this disorder appears without initialization by trauma; typically the affected pup between 3 and 10 months age has rather sudden pain or a very stiff carriage of the neck, and increased discomfort when the head and neck are manipulated. Histologic and radiographic examinations reveal similarities to necrosis seen in some other bone disorders, and the wearing away of bone that encourages the axis to ride up and into the canal ahead of it, the vertebral body putting pressure on the ventral surface of the cord. There is a projection on the axis called the dens, resembling the prow of a boat, which is normally attached to the atlas by a ligament between the tip of the dens and the floor of the spinal canal in the atlas, and is also attached to the rear of the skull by ligaments running through the atlas. In the case of congenital absence of the dens, this internal support between the axis and the bones ahead of it is also missing, tending to let the axis tilt upward in front, eventually tearing another ligament which holds the tops of C1 and C2 close together.

Because this subluxation is an abnormal flexion of the two vertebrae, it is partially alleviated only while the dog holds its head up and its neck somewhat extended. If the cord is sufficiently pinched, short stride, pain, paresis, paraplegia, quadriplegia, and complete paralysis may be the successively worse signs. The reason all four limbs are often affected, whereas just the rear is affected in Wobbler Syndrome or GSD myelopathy, is that the cord is compressed closer to the brain, ahead of the branching out of nerves to the rest of the body.

Treatment has included fusing of these two vertebrae, wiring the dorsal arches together so they cannot move up and down in relation to each other, or even stabilization with plates and/or screws. 
totalgsd Copyright 2001 Fred Lanting, Canine Consulting. Mr.GSD@juno.com. All rights reserved. 
Reprinted with kind permission of Fred Lanting Author of  The Total German Shepherd Dog. This is the expanded and enlarged second edition, a "must" for every true GSD lover. It is an excellent alternative to the "genetic history" by Willis, but less technical and therefore suitable for the novice, yet very detailed to be indispensable for the reputable GSD breeder. Chapters include: History and Origins, Modern Bloodlines, The Standard, Anatomy, The German Shepherd in Motion, Shows, Showing, and Training, The Winners, Nutrition and Feeding, General Care and Information, Health and First Aid, Parasites and Immunity, Diseases and Disorders, The Geriatric German Shepherd, Breeding, Basics of Genetics, Reproduction, Whelping, The First Three Weeks, Four to Twelve Weeks, Trouble-shooting Guide
Permission to reprint this article may only be given by the author Fred Lanting
mailto:mrgsd@hiwaay.net
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What is cervical vertebral instability?

http://www.upei.ca/cidd

related terms: Wobbler syndrome, cervical spondylomyelopathy, cervical vertebral deformity
Anatomy of the vertebral column and spinal cord: The vertebral column, or backbone, is made up of a series of small bones, the vertebrae. These bones surround and protect the spinal cord, the large collection of nerves through which information is transmitted between the body and brain. The spinal cord must be intact and undamaged in order to feel sensations (including touch and pain), and for normal movement of the body and limbs. The individual vertebrae are separated by intervertebral disks. These soft tissue structures allow for normal movement between the vertebrae, and also act as shock absorbers.

In cervical vertebral instability, there is compression of the spinal cord in the neck (cervical) region. There are seven vertebrae in the neck which surround and protect the spinal cord. Movement between these bones allows normal movement of the neck. With this condition, there are abnormalities in the structure of the vertebrae, of the ligaments that connect them, and/or of the disks between them. The reasons for these abnormalities are not clear; inheritance is a factor, and overfeeding in rapidly-growing large breed dogs is also thought to play a role.

The result is instability between adjacent vertebrae, narrowing (stenosis) of the spinal canal, and pressure on the spinal cord. The consequences of compression of the spinal cord in the neck region are  weakness and incoordination in all 4 legs - hence the name "wobbler".

How is cervical vertebral instability inherited?
Unknown. It has been suggested to be autosomal recessive in the Great Dane, Doberman pinscher, and borzoi.

What breeds are affected by cervical vertebral instability?
This disease is most common in the Great Dane, where the signs are first seen between 3 and 18 months of age, and the Doberman pinscher, where problems develop later, between 3 to 9 years. Cervical vertebral instability is also seen in most other large breed dogs, including the St. Bernard, Weimaraner, Labrador retriever, German shepherd, boxer, Rhodesian ridgeback, dalmatian, samoyed, old English sheepdog, bull mastiff, Borzoi, rottweiler, chow chow, golden retriever, Irish setter, Irish wolfhound, and Great Pyrenees, and in the basset hound, fox terrier, and beagle.

For many breeds and many disorders, the studies to determine the mode of inheritance or the frequency in the breed have not been carried out, or are inconclusive. We have listed breeds for which there is a consensus among those investigating in this field and among veterinary practitioners, that the condition is significant in this breed.

What does cervical vertebral instability mean to your dog and you?
The main signs with this disease are weakness and incoordination (ataxia); these signs begin insidiously and worsen slowly over several months. It may look like your dog doesn't know where his or her feet are. This will be most obvious when s/he is rising from lying down, or negotiating a turn or stairs. Over time, your dog may develop a stiff, high-stepping, exaggerated gait that gradually worsens.

The signs are bilateral and symmetrical (meaning they occur equally on both sides). All 4 legs are eventually affected, with the hind legs affected first, and more severely.  Sometimes there is a sudden change for the worse as a result of minor trauma. Doberman pinschers often experience severe neck pain (as a result of disk herniation- see intervertebral disk disease) and may develop rigid front legs.

This is a chronic, progressive disease (ie. it gets worse with time). Without treatment, your dog's condition will gradually deteriorate.  With therapy (either medical management or surgery) the prospect for recovery remains guarded.

How is cervical vertebral instability diagnosed?
Your veterinarian will suspect this disease if your large-breed dog displays the characteristic clinical signs: slowly progressive, bilateral, symmetrical hind leg weakness and ataxia. The front legs are affected after the hind legs, and usually less severely. Your dog’s neck may be painful, and may be held flexed slightly downward. Plain x-rays are taken to show structural abnormalities in the vertebrae, but myelography is necessary to determine if there is spinal cord compression. In order to do a myelogram, your dog is anesthetized, dye is injected into the spinal canal, and x-rays are taken which will show the exact location(s) of spinal cord compression. This information is essential in considering treatment options, especially if surgical repair is to be attempted. Other imaging techniques, such as CT scans and MRI, may also be used. Your veterinarian may refer you to a veterinary referral centre for these specialized radiographic techniques, and for potential surgery.

For the veterinarian: The two most commonly affected breeds have characteristic lesions; older Doberman pinschers frequently show ventral spinal cord compression, while young Great Danes show dorsal spinal cord compression. Lesions are more common at the more caudal cervical segments (C5-6 and C6-7). Underlying systemic or metabolic diseases may also be present. "Traction" myelograms can be used to demonstrate the dynamic component of this disease (instability between vertebrae). Forced extension of the neck may exacerbate spinal cord compression.

How is cervical vertebral instability treated?
The type of treatment chosen for this condition will depend on a number of factors, including the severity and duration of your dog’s signs, and the extent of spinal cord compression apparent on radiography. The goals of medical management are to minimize neck movement (through confinement and use of a neck brace) and use anti-inflammatory  medications to prevent further damage to the spinal cord. Medical management may be effective for weeks to years, although it does not address the underlying problem of spinal cord compression. A variety of surgical techniques have been developed (and more are being developed) which attempt to both alleviate the spinal cord compression and stabilize the vertebrae. Surgery is not without risk, including a variety of potentially severe postoperative complications. Ultimately, the prospects for recovery depend on a number of factors, including duration and severity of clinical signs, and whether the spinal cord is compressed at a single site or at multiple sites.

Because of the requirement for both specialized radiographic and surgical techniques in treating this condition, your veterinarian may provide initial neck stabilization and anti-inflammatory therapy for your dog, and then refer you to a veterinary referral centre for further treatment.

Breeding advice
Although the exact mechanism of inheritance is not known, dogs with cervical vertebral instability should not be bred. (Unfortunately, because this condition often has a later onset, dogs may be bred before any problems appear). It is best to avoid breeding their parents or siblings as well, who are considered potential carriers of the trait.

The best ways to avoid this condition in a large breed dog are to inquire before purchase if there is any family history of vertebral instability, to refrain from providing mineral supplements to the diet, and to feed several small meals daily (rather than ad libitum feeding).
FOR MORE INFORMATION ABOUT THIS DISORDER, PLEASE SEE YOUR VETERINARIAN.

Resources
LeCouteur RA, Child G. 1995. Diseases of the spinal cord. In EJ Ettinger and EC Feldman (eds) Textbook of Veterinary Internal Medicine, p. 629-696. WB Saunders Co, Toronto.
Copyright © 1998 Canine Inherited Disorders Database. All rights reserved.Revised: July 24, 2002.
This database is a joint initiative of the Sir James Dunn Animal Welfare Centre at the Atlantic Veterinary College, University of Prince Edward Island, and the Canadian Veterinary Medical Association.
reprinted with kind permission from:-
 Alice Crook, DVM,Coordinator, Sir James Dunn Animal Welfare Centre, Atlantic Veterinary College,University of Prince Edward Island, 550 University Ave.Charlottetown, PEI C1A 4P3
http://www.upei.ca/cidd

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A Wobbler's Tale

 Treating Wobbler's via Acupuncture
  http://www.wobblerstale.bravehost.com/


wobblerstale In February of 2003, my 5 year old Doberman, Lorelei, was diagnosed with Wobbler’s Syndrome. I knew nothing about Wobbler’s, and turned to the internet to try and educate myself about this condition. I found very little info, and what I did find dealt mainly with treating Wobbler’s via conventional methods, such as surgery. In the end, we treated Lorelei via acupuncture, and with great success. It is my hope that Lorelei’s story will help anyone who finds themselves in the same situation in which Lorelei and I found ourselves in February 2003.
Lorelei came to me by way of the humane society/animal control facility where I worked. She was about 5 months old. She was picked up by animal control, running loose. No one ever came for her. So she became my girl in January 1998. I named her Lorelei after the song by Styx.

All was well until that February, when I began to hear her cry out in pain in the night. Then I noticed that she was unable to raise her head high enough to drink out of the water dish that I kept on a small table on the deck outside, elevated in order to keep the dogs from splashing all the water out. On further observation, I realized that she could raise her head no higher than straight out. I knew we had a problem. I took her to her vet, who observed her and suggested to me that she could possibly have Wobbler’s. He offered me several options, such as X-rays, a myelogram, or just observing her to see how she did. We went home to think it over, with some medication to help ease Lorelei’s pain.

I immediately got on the internet, where I found very little information. In the meantime, Lorelei began slipping on slick floors – her feet would just splay out in all four directions. After about three days, I decided to go ahead have the X-rays done to see if that would shed any light on the problem. It did not. After further searching on the internet, I learned that surgery for Wobbler’s often includes a long and painful recovery process, and that it sometimes only has about a 50% success rate. This didn’t sound too good. Then came the “straw that broke the camel’s back” – I learned that the cost of surgery for Wobbler's can be upwards of three thousand dollars!! Upon learning this, I knew I had to find another way. Then I came across Christy Waehner’s site, detailing her experience in treating her beautiful Doberman, Sylvia, for Wobbler’s by way of gold bead implants. Christy very kindly shared her insight and suggestions with me, and was very helpful. After hearing about her successful experience with the implants, which is based on acupuncture, I became a lot more open to the idea of some sort of alternative treatment for Lorelei.

reprinted with kind permission from Terry
http://www.wobblerstale.bravehost.com/

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A Non Surgical Treatment
 A Collection of Articles on Wobblers
 Sylvia's  Diet, Supplements and Vaccination protocol
 Gold Bead implants
Memory Foam Pet Beds
 Wobblers-Is there an alternative to surgery
 Wobblers Syndrome
 Wobblers Syndrome in Dogs
Perspective on Cervical Vertebral Malformation/Malarticulation (Wobblers Disease)
 Know signs, therapeutic options for canine Wobbler syndrome
 Wobblers Cause and Treatment
 Wobblers
Wobblers Syndrome




Cervical Ventral Distraction
and Fusion



Join
http://groups.yahoo.com/group/wobblers
( a  discussion group with other wobbler dog owners providing  emotional support during the fight with wobblers)

chloebutton  talabutton  

The above information is simply informational. It's intent is not to replace the advice of a veterinarian nor to assist you in making a diagnosis of your pet. Please consult with your own veterinarian for confirmation of any diagnosis. Your pets life may depend on it.