A blanket for covering a four-legged, tailed animal includes a main panel configured for draping over the animal's back and defining a rear edge adjacent the animal's tail. The blanket also provides a chest panel connected to and underlying the main panel and configured to be wrapped around the animal's chest and neck. The chest panel includes a pair of expansion gussets for enhancement of the flexibility and fit of the chest panel about the animal's chest and neck. Finally, the blanket provides an elastically biased tail flap attached to the underside of and extending downward from the rear edge of the main panel.