Well Its indeed hard and bring many problems, maybe.... Its said presets? 3 differents body sizes would be more easy like small medium and big, bunny or fox like size, the normal canine size and the big....no idea lol but its better than put a bunch of bugs and work
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It would still need additional animations to work together. Every animation would need an animation that corresponds to the partners animation, and even with three sizes that would be a lot. I'm not saying its impossible, but it would far more than quadruple the animation count in the game. It may be better suited to being a mod.