Okay I will start with the positives first then the negatives.
Positives: You have great voice acting and the sound is very crisp. It's VERY hard to get clear voice recordings from others, I have tried and there's always some horrible unfiltered crap in the background. You have an okay color scheme.
Negatives: The character's heads are constantly changing shape and size, and I don't mean the obvious like side view and front view (those are obviously going to differ in size on animals like wolves.) What I am talking about is the inconsistency in the design. The Wolf's head in times; 0:38 , 0:54 and 1:24 all look very different in design. The anatomy of both character's are a bit flawed. From 1:04 - 1:08 the arm and the hand of the Lynx are out of proportion.
What I really recommend is practicing drawing people in real life to grasp good anatomy and perhaps pick up some good anatomy books at the store or library. A Japanese friend who does professional manga recommended a book to me a few years back called: Figure Drawing for All It's Worth. Check it out if you can. Also, try videotaping people or getting videos from youtube or other video sites and study the action in a program that lets you look at each frame (like VirtualDub.) Lastly, make a set of the characters heads from ALL angles. If you are near a zoo and they have Lynx or wolves there try sketching them from every possible angle (the best time to go to the zoo and see the animals up close is VERY early in the morning, like right when the zoo opens.) you can also videotape them.
Very last note, I understand you put a lot of work into this, I should know, frame by frame animation is no easy feat. I did a 2 minute animation a few years back and it took 2 months to complete, and this was without barely any sleep. Keep working at it and you will improve a lot!