The Soviets have attempted to domesticate the fox, mentioned in the article Busted Bright Fox, and were able to do so in just nine generations, or less than a human lifetime. This also resulted in other changes, including color, which became Dog Cages black, white, or murky and white. They also developed year-round breeding ability, curled-up tails, and droopy ears.

Modern dog breeds show more variation in size, appearance, and behavior than any other domestic animal. Within the range of extremes, dogs generally share attributes with their wild ancestors, the wolves. Dogs are predators and scavengers, possessing sharp teeth and strong jaws for attacking, holding, and tearing their food. Although fastidious breeding unfashionable changed the appearance of numberless breeds, all dogs retain key traits from their distant ancestors. Like manifold other predatory mammals, the dog castaway powerful muscles, fused wristbones, a cardiovascular logical order that supports both sprinting and endurance, and teeth for catching and tearing. Unlike humans which are plantigrade, dogs are digitigrade.