i am new to this but buddie try this.

instead of relying on muscle strengh why dont you us point binding.

u know where you chose the points in which the bone will have effects on. I think that will help you tremendously.. oh yea and see how a dog or cat walks that will help.

for your info.......... depending on what version of illustrator u are using just by importing an AI file might not always work... incase you import an AI file and when is brought into MOHO or AS and it comes out all miss-shaped here is the fix: when you create anything in AI and you are planning to...