The Arctic fox is about the size of a large domestic cat. It is part of the canid family, meaning it is related to other foxes, wolves and dogs, and it is the smallest wild canid found in Canada.The Arctic fox has a brown or grey coat with a lighter belly in the summer, and it turns into a thick, white one during the winter season. The white coat makes it very hard for the fox's prey to see it in the snow before it's too late. Some have a grey to dark grey-blue coat in the winter. The Arctic fox is the only canid that changes the colour of its coat in the summer.