Sonic: Night of the Werehog (Monster Transformation)

I get bothered when people call Sonic a "werehog". "Were" means "man"--a real werehog is a man who transforms into a hog. Sonic is already a hedgehog--all his transformation involves is growing claws and extra muscles and fur. Anyway, here's an animated short Sega put together to promote the new video game, called "Night of the Werehog." There's no time counter, but I can say that the TF is in the final third of the film. See it here.

Werepig (Pig Transformation)

Here's a Spanish claymation short about two boorish American tourists who come to a squealing end. The (anti-)American jokes are rather heavy-handed, but the claymation is very well done.

Batman: The Brave and the Bold (Animal Transformations)

(Edit: the youtube links in this post no longer work, but you can view the scenes at Shadowlord Inc., thanks to Dragoniade.)

I'm a bit late in posting this one (which is especially galling since I was aware of this TF a week before it aired), but here's an ape transformation from the "Terror on Dinosaur Island" episode of Batman: The Brave and the Bold. The villain Gorilla Grodd is attempting to transform men into gorillas, but his first victim doesn't make it all the way into gorilla-hood. It's really more of a muscle-expansion/clothes bursting transformation than an animal one, but that's all the TF we get. Watch it here. TF begins at the 03:39 mark. Here's hoping this show airs as many transformations as Batman: the Animated Series, the landmark cartoon that proved Americans could match the Japanese.