Myth #4: You should let long hair grow out, ungroomed, in the winter.
In the same way a dog's coat keeps him cooler in summer, it also keeps him warmer in winter, but a haircut isn't the only part of grooming. Some pet owners actually believe that it's OK to let mats form all winter long, thinking it insulates the dog better. Not true! Air needs to get to your dog's skin, or bacteria and moisture could get trapped, leading to uncomfortable and even infected hot spots and other skin irritation. A long furry coat is warming and comforting in the winter, as long as it stays clean and tangle-free.