Holy @#$%, why isn't this on Cartoon Network?! (Or possibly the Disney Channel.) This is the spiritual successor to every Tex Avery cartoon ever! (Or a classic Mickey Mouse short.) It's so cartoonishly bouncy and fluid and funny and snappy and sappy and sweet and combines all the typical 'toon clichés and tropes in the best way possible like a multi-fruit smoothie.
The acting's great, the animation's terrific, the characters are archetypal but funny and endearing -- yes, even bully-jerk dragon. At first, I thought that horse dance number went on waaay too long, but in the end, it wound up being the best kind of foreshadowing ever. (And another typical chased-after-girl-dumps-both-romatic-rivals cliché, but again, a rare justified-besides-for-the-LOLz one -- though, there were PLENTY of LOLz -- which just makes it all the more amazing.)
I hope you're pitching stuff to networks by now because, believe me, this is better than even 75% of the stuff on TV right now. For serious.
Mega-congrats and good luck on all your future projects!