Possible Health Conditions
Eye defects of varying severity are the most common disorder in Australian Shepherds of all size varieties. The following disorders have been recognized in the Australian Shepherd of all sizes:
Iris Colobomas (IC): A cleft in the iris of the eye. If large, it will impair vision. A dog with a small IC may be sensitive to bright light. While the exact mode of inheritance is unknown, it is probably polygenetic. They may also be the result of abnormal development in puppies from merle to merle breedings.
Juvenile cataracts: A congenital opacity of the lens of the eye due to abnormal early degeneration of the lens tissue. This can result in gradual and painless deterioration of sight, resulting in partial or complete blindness by 2 to 5 years of age.
Persistent pupillary membrane (PPM): PPM is rare, but possible. During normal development, a puppy's eyes are enveloped by a membrane which stretches and breaks away by 8 weeks of age. In an affected dog, the membranes fail to break free, whether on the front of the eye, or behind it. It causes varying degrees of vision impairment depending on placement and concentration of the strands. Diagnosis can be mild to severe. If strands have not broken free by 8 weeks, the dog is inclined to carry them for the rest of its life.
Progressive retinal atrophy (PRA): PRA is common in many breeds of dogs and has been identified in Australian Shepherds. It affects the entire retina and is the canine equivalent of retinitis pigmentosa. The disease is recognized first in early adolescence or early adulthood. Puppies may be blind by six to eight months. All dogs affected with PRA eventually go blind. Carriers show no clinical symptoms. Symptoms are subtle, starting with night blindness, some eye dilation, progressing to complete blindness. It is quite common not to notice anything wrong until the dog is nearly completely blind.
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