The character has gone through some major changes through his existence. The first one happened with The Pointer in 1939 and The Sorcerer's Apprentice section of Fantasia in 1940, where he was given pupils in his eyes, a skin colored face, and a pear-shaped body. In the 40's, he changed once more in The Little Whirlwind, where he used his trademark pants for the last time in decades, lost his tail, got more realistic ears that changed with perspective and a different body anatomy. But this change would only last for a short period of time before returning to the one in The Pointer, with the exception of his pants. In his final theatrical cartoons in the 50's, he was given eyebrows, which were removed in the more recent cartoons.