Illustrated Articles
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Carpal hyperextension is an abnormality of the carpus that causes increased extension of the joint. There are many causes of carpal hyperextension: it can be caused by trauma; in young dogs it may be caused by a developmental abnormality; and in older dogs it may occur as a degenerative condition. Dogs with carpal hyperextension have a noticeable bend at the wrist, forcing their lower limb into an abnormally flattened position. If carpal hyperextension is caused by trauma, it may also be associated with pain and swelling. A tentative diagnosis of carpal hyperextension can be made based on initial observation, but a thorough physical examination is necessary because dogs with carpal hyperextension may also have abnormalities in other joints. Treatment of carpal hyperextension depends upon the cause and severity of the condition and can range from medical management to surgery.
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Carpal laxity is a condition in which the carpus has an abnormal or excessive range of motion. Carpal laxity can show up in one of two ways: carpal hyperextension or carpal flexion. The underlying cause of carpal laxity has not been definitively determined but may be caused by nutritional factors, genetic factors, and being raised on slippery flooring surfaces. Signs of carpal laxity may be seen at any time from 6 weeks of age onward, but the condition is most commonly noted between three and six months of age. Activity modification is often recommended for affected kittens by keeping them off slippery surfaces. Most kittens with carpal laxity will appear completely normal within six to eight weeks.
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Carpal laxity is a condition in which the carpus has an abnormal or excessive range of motion. Carpal laxity can show up in one of two ways: carpal hyperextension or carpal flexion. The underlying cause of carpal laxity has not been definitively determined but may be caused by nutritional factors (specifically excessive caloric intake and/or excessive calcium intake), genetic factors, and being raised on slippery flooring surfaces. Signs of carpal laxity may be seen at any time from 6 weeks of age onward, but the condition is most commonly noted between three and six months of age. Activity modification is often recommended for affected puppies by keeping them off slippery surfaces. Most puppies with carpal laxity will appear completely normal within six to eight weeks.
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House soiling in cats, also called feline inappropriate elimination, is the most common behavioral complaint of cat owners. Problem behaviors can be urine and/or stool deposited outside of the litter box, or marking behaviors.
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Cataract formation is a reasonably well-known occurrence in pet birds. Canaries are more prone to cataract formation than other species of birds. Cataracts may be inherited or be secondary to a traumatic injury or infection involving one or both eyes.
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A cataract is an increase in opacity of the eye’s lens. Any type of inflammation or damage to the lens can lead to a cataract. The clinical signs of cataracts vary depending on the size of the cataract; many cataracts are asymptomatic at the time they are diagnosed during a veterinary exam. The ideal treatment for cataracts is surgery, but not all cats are candidates for surgical treatment. In these cases, anti-inflammatory medications may be used to prevent glaucoma and other secondary complications of cataracts.
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Inside the eye is a lens that focuses light on the back of the eye, or retina. Vision occurs at the retina. The structure of the eye is similar to a camera, which has a lens to focus light on the film. A cloudy or opaque lens is called a cataract.
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Cerebellar hypoplasia is a developmental condition in which the cerebellum of the brain fails to develop properly. It most commonly occurs when a pregnant cat becomes infected with feline panleukopenia virus and passes the infection to her unborn kittens. Since the cerebellum is responsible for purposeful movement and coordination, the symptoms of this condition may not become apparent until the kitten starts to try to stand or walk on its own. There is no treatment; however, kittens with cerebellar hypoplasia are not infectious to other kittens or cats, are not in any pain, and will learn to adapt to their disability over time.
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The intervertebral discs allow movement in the spine and act as shock absorbers between the vertebrae. If the disc degenerates or is damaged in some way, the disc may bulge and put pressure on the spinal cord and/or the roots of the spinal nerves that come off the sides of the spinal cord. This pressure can cause symptoms ranging from severe pain to weakness to paralysis. There are several breeds that experience a higher frequency of the condition. The severity of a dog’s clinical signs depends upon several factors. Conservative management with pain relievers and anti-inflammatory medication is recommended with a gradual onset of clinical signs or when clinical signs are limited to pain and/or a mildly wobbly gait. Surgery is recommended when there are repeated episodes of neck pain, when neck pain is severe, when there are severe nervous system deficits, or when the dog has not responded to conservative treatment.
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Cervical vertebral instability (wobbler syndrome) is caused by compression of the spinal cord, usually at the base of the neck. Although the spinal cord compression occurs in the neck, the hind legs are often affected first. In severe cases, the dog may suddenly develop total paralysis of all four limbs. The condition is most prevalent in Great Danes and Doberman Pinschers. Most pets enjoy a relatively normal lifestyle following surgery.
