Should you cut a dog's hair in the winter?
A dog's hair and fur protect it from cold in the winter, and
from the hot sun and warm weather in the summer. This works OK for
a dog, since they do not sweat like humans to lose heat.
A dog's coat should be neatly trimmed for appearance, but not
cut very much shorter. Heavy brushing in the Spring and in Fall is
good to clean out dead or dying hair.