Uncle Barnum is presumably an anthropomorphic dog.
Description[]
A circus owner, Barnum is an uncle of Goofy's and somewhat lackadaisical about his handling of tamed beasts: in 1957, having to go out of town, he left his two white tigers (whom he described as "kittens") in the care of his nephew Goofy.
Behind the scenes[]
Uncle Barnum is mentioned in the 1957 one-pager Tiger Pets.
He is, naturally, named after famed showman P. T. Barnum, who also has a counterpart in the Disney comics universe.