Consider the question. Pete (also called Peg-Leg Pete, Pistol Pete and Black Pete, among other names) is an anthropomorphic cartoon character created in 1925 by Walt Disney and Ub Iwerks. He is a character of The Walt Disney Company and often appears as a nemesis and the main antagonist in Mickey Mouse universe stories. He was originally an anthropomorphic bear but with the advent of Mickey Mouse in 1928, he was defined as a cat. Pete is the oldest continuing Disney character, having debuted three years before Mickey Mouse in the cartoon Alice Solves the Puzzle (1925).

What animal is big pete from mickey mouse?
If the answer is 'originally an anthropomorphic bear but with the advent of Mickey Mouse in 1928 , he was defined as a cat'; explain the reasoning:
To answer this question, we should know that: He was originally an anthropomorphic bear but with the advent of Mickey Mouse in 1928, he was defined as a cat.