I love this.
This is going in my favorites, along with all your other ones. This is definitely your best work, graphics and animation wise. Some people may say the story came in slow... but I just think that people do not realize what the story is. The story to me was perfect... littlefoot wandering, bitey, the mean goat thing, looking around. It fit in perfectly with Bitey and LittleFoot meeting, and LittleFoot goes rabid. It was just perfect... very excellent.
The characters were made very nice. The only part I thought was a little off... was when LittleFoot bounced like 100 feet. That was kind of off to me. I liked Bitey's speed, it was incredible, he is a truly amazing creature. LittleFoot was so cute, no doubt, I couldn't hold myself back from "Awwww". I love the fart sack creature thing too, that is some messed up but cool thing.
The vast and amazing lands and backgrounds were too good to be true. Even the foregrounds you have going, with the blurred grass, and such. You capture every aspect of the world they are in, just truly amazing.
The sound, well, except for the creatures, there wasn't much. The only thing you need to work on is more sound. The sound you had going was great. Just some more.
More great work from you, I'm not surprised.