Foxes are about as big as a medium-sized dog. Generally, they are red to rust in color. Compared to dogs, foxes have narrower snouts and bushy tails. They tend to be more lithe than domestic dogs. They are more active at night, but aren’t fully nocturnal. Like cats, they can climb trees. Foxes bark like dogs and can howl in a way that sounds closer to a scream. Foxes will often use man-made structures for shelters. They will often break into sheds or dig under decks to create their dens. In the wild, they can dig out burrows. Some will even dig under the foundation of a shed or home and make a den under the structure.