Great! But it's a bit dull...
First of all, loved the animation. Nice, fluid, entertaining, so on and so forth. I also liked the concept at hand here and the characters. The rest wasn't as flawless.
One thing that bothered me was the sound effects. The sounds themselves were fine, but it seemed to me that they were a bit too loud and overshadowed everything else. And I don't know if you were aiming for a family-oriented cartoon, but some of the jokes seemed rather boring, typical, and predictable. Also, I'd keep the no voices thing going. It worked really well for this.
Other than those complaints, the cartoon was rather sweet. I'll keep this at a 7 and vote a 4 just because you did an awesome job animating it.