While the survival of wolves and canids in the wild depended in part on the density of their thick, double-layer coat in cold weather and the ability to shed and allow good air circulation through their coat in warmer times, these factors are almost moot as survival tactics in domestic dogs. Similarly, wild canids needed to blend into their surrounding to hunt prey and elude predators, but coat types and colors are now more related to aesthetics than survival.

While most dogs shed, the discarded hairs of some types of fur are more noticeable and omnipresent. Allergy sufferers might want to avoid the heavy-shedding German shepherd, for instance, and stick with a poodle — this breed's fine hair is not shed, but instead must be trimmed by a groomer several times a year.

Along with their color, dogs' coats vary in length, type, texture and density, from the herding puli's long, dense, water-resistant double coat to the stiff, short, bristly fur of the Chinese shar-pei. Make sure you are aware of any special grooming needs of the breeds that interest you. Also take into account the expense of having a dog clipped regularly. Breeds such as the poodle, Airedale terrier and bichon frise need regular clipping. Call groomers in your area for sample prices and an idea of how often this needs to be done.

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