King-Size Canary

Don't let the title card fool you -- the canary does not actually look like this in the cartoon itself.

King-Size Canary is a landmark 1947 Tex Avery cartoon made during his MGM tenure during The Golden Age of Animation, voted no. 10 on The 50 Greatest Cartoons list. This oneshot short is centered around a hungry cat who, in an attempt to get more meat out of a pea size canary snack ("Well... I'm sick."), pours a bottle of Jumbo Gro Plant Growth formula on him-only to make him grow to gargantuan proportions. The tables keep turning and turning as one of the other keeps drinking more of the formula as their battle continues. Obviously, Hilarity Ensues.

The plot was recycled for the Sylvester Cat and Tweety Bird short Hyde and Go Tweet in which Tweety Bird accidentally drank Dr. Jekyll's formula, much to Sylvester's confusion.

Tropes used in King-Size Canary include:

Angry Guard Dog
Attack of the 50-Foot Whatever
Born in the Theater: The mouse tells the cat that he will save his life. He knows because he's seen the cartoon before!
Canis Major
Chekhov's Gunman: The mouse the cat meets early the in short, who promises to save him later. He does.
Escalating War: Between the cat and the canary. And then between the cat and the dog. And then between the cat and the mouse.
Mega Neko
Mouse Hole: A train tunnel is used as one later on in the short.
No Fourth Wall:

Mouse: Ladies and gentlemen, we're gonna have to end this picture. We just ran out of the stuff. Good night.

Rodents of Unusual Size
Serial Escalation: By the end, the characters have grown so massive that they are bigger than planet they're standing on!
So What Do We Do Now?: Occurs when they run out of the formula and are stuck at the exact same size as each other.