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Advances in veterinary medicine have led to increased longevity for pets, but special problems still crop up in older animals, especially dogs, either as a direct or indirect result of aging.

The amazing power of a dog's ability to pick up on a scent has been demonstrated as a key service to humans by looking at the history of several dog breeds. For example, the German Shepherd is specifically suited for police work and is one of many type of dogs that breeders have taken a keen interest in developing for their specialties in scent hunting.

It is believed that canine hip dysplasia has increased since large breeds of dogs evolved into companion dogs from the hunting or guard functions for which they were bred and kept for in the past. One piece of evidence is the way breeders had selectively bred aggressiveness out, and tamed the dog down, so as to create a desirable trait.