Check it out, it was done for a school assignment! :)
http://igloo.zapto.org/~corby/stock/bear.html
If I was that bear I would have pwned the dog. Bears are tougher than dogs.
its ko0l, for your next animation you should look into using frame by frame animation, rather than using motion tweens. It takes a while longer but the overall effect is a lot nicer.
-OSC