Whoa dude, this was awesome.
"So... who can leave me the filthiest review?"
<filth>Fuck you you stupid faggot I hope you burn in hell I'm going to call the ASPCA on your ass for animal cruelty, I don't wanna see a half-eaten dog. What is that, pixels? Your flash messed up, dude. You should just quit Newgrounds.</filth>
Okay no but here's the serious review: You're really good when it comes to in-betweening frame by frame, the dog morphing into the cupcake is a great example of that.
When the scene temporarily changed to the Green, zombie-esque version it was a total U-turn in what I see from you. It surprised me, in a really cool shocking way. Then it went back into the innocent version and closed up the animation with it.
The music mix was a really good choice for this song, especially how the pitch reverts to a lower, sort of sinister tone and goes back up to that upbeat piano oldskool.