Collision detection in .fbx

I am new to unity . I have created two .fbx animation and imported it into the unity. I have also added simple walk script into it. They its all work fine. Now i want that when both these objects collide with each other then they can’t cross each other and a sound will produce…How to do this…Is there any help for this…THanks in advnce

Generally, animated objects should not use mesh colliders. Instead, use primitive colliders attached to the bones, or just one capsule collider if you can get away with it.