The Old English Sheepdog (OES) is a large breed of dog that emerged in England from early types of herding dog. Obsolete names for the breed include Shepherd's Dog and bob-tailed sheep-dog. The nickname Bob-tail (or Bobtail) originates from how dogs of the breed traditionally had their tails docked. Puppies are born with a black and white coat, and it is only after the puppy coat has been shed that the more common grey or silver shaggy hair appears. The Old English Sheepdog Club of America sponsors investigations into diseases encountered in the breed in order to assist breeders in selecting healthy dogs for breeding, and breeders of Old English Sheepdogs who are members of the Old English Sheepdog Club of America must support its Code of Ethics in breeding and selling sheepdogs. Some diseases being investigated include hip dysplasia, cataracts, glaucoma, entropion, thyroid problems, deafness, diabetes, HD, PRA, allergies and skin problems. There is no data on how many dogs are affected, or what percent of the breed is affected by any of these ailments.
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