What was Columbus dog called?

Answer 1

Columbo's dog was originally called Fang. The spin-off series KATE LOVES A MYSTERY (MRS. COLUMBO)/NBC/1979 featured the wife of Detective Columbo, Kate Columbo (Kate Mulgrew) who owned a lazy basset hound dog named Whitefang.

Answer 2

Considering the fact that the dogs were used commonly described as "attack dogs" and were used as weapons against the Indians it would more than likely be a type of ancient Molosser breed.