A Rat Terriers coat is short and smooth with dense, shiny fur. Youll see it in several colors and combinations of colors, including white, black with tan or rust, white and black or tan, red, lemon, blue, chocolate and orange. Ticking (intermittent spots) and dark colors are seen too. Can Rat Terriers be left alone? Exercise, and a crate or secure dog-proof space, are the keys to preventing destructive behaviors and excessive barking when a Rat Terrier is left home alone. They may be ...