Dog coat
A dog's coat is its fur. A dog can be double coated—that is, having both a soft undercoat and a coarser topcoat. Some dog breeds are single-coated—having only one type of coat or the other, more often only the topcoat. The state of the coat is considered an indication of the animal's breeding and health. Most dogs shed their undercoat each spring and re-grow it again as colder weather comes in; this is also referred to as blowing the coat. Many domesticated breeds shed their coat twice a year. In many climates, the topcoat and undercoat might shed continuously in greater and smaller quantities all year. Go ahead and put that sweater on. It will help a little, but you can't depend on it entirely to keep her warm. Pets lose most of their body heat from the pads of their feet, their ears, and their respiratory tract. The best way to guard your animals against the cold is keeping a close eye on them to make sure they're comfortable.