Small and rough-coated with otter-like heads, Border Terriers are immensely popular pets, being intelligent, friendly and companionable. They are working dogs and good at keeping vermin down, so best not kept with free-range hamsters or other small furry pets. Border Terriers played key roles in two films: There’s Something about Mary, and Baxter was Ron Burgundy’s beloved miniature Buddha, covered in hair, in Anchorman.