Health
While Rough Collies are generally resilient and healthy, there are some health problems that can affect the breed.
Collie eye anomaly (CEA), a genetic disease which causes improper development of the eye and possible blindness, is a common ailment in the breed. More rarely, Rough Collies can be affected by progressive retinal atrophy (PRA), another genetic disease in which bilateral degeneration of the retina results in progressive vision loss culminating in blindness. Through genetic testing and careful screening program it would be theoretically possible to eradicate both of these problems in purebred lines, however, certainly in the UK, the Kennel Club does not require these tests to be done either for registration or showing. CEA is so prevalent that elimination of affected dogs except through very slow and careful breeding decisions to avoid shrinking the gene pool more than absolutely necessary. Rough Collie puppies should be screened at an early age (6–8 weeks) by a certified veterinary ophthalmologist to check for CEA. PRA has a later onset and can be detected by DNA test, but is much less widespread (in the US) than CEA. (In the UK, PRA is more common.) Note, the UK Kennel Club "Accredited Breeder Scheme" requires eye tests and recommends the genetic test for this class of members, .
Canine cyclic neutropenia is a cyclic blood disorder that is usually fatal to affected puppies. The disease is also referred to as "gray collie syndrome", due to affected puppies having a pale gray, pinkish/gray or beige colouring, none of which are normal Rough Collie colours. Puppies that survive through adulthood are plagued with immune disorders throughout their lives and rarely live more than three years. DNA testing can help detect carriers of the recessive gene that causes the disease.
Hip dysplasia: As with most of the larger breeds, hip dysplasia is a potential concern for Rough Collies. Although this disease appears to be "multigene", careful selection by many breeders is reducing this problem. The UK Kennel Club "Accredited Breeder Scheme" requires hip-scores this class of members, however, a very small proportion of UK registered puppies are bred under this scheme. Hip dysplasia is rare in collies compared to their closest relatives and other breeds of the same size.
Rough Collies may carry a mutant Mdr1 gene that results in a sensitivity to Ivermectin and related drugs. A screening test is used to determine if alternative medications are required. Overdoses from the proscribed medications can result in neurological imparement or even death. This faulty gene is present in several breeds, but is well known among collies.
In addition to these problems, all of which can be tested for, there are a number of problems which are thought to be genetic but for which no screening test exists. These include epilepsy, bloat, a tendency towards allergies, and thyroid disorders (primarily hypothyroidism.). Because no DNA tests exist for these disorders (and all can have causes other than genetic origins), breeders can only do their best to avoid producing them by removing affected dogs from the gene pool.
Read more about this topic: Rough Collie
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