I have a yearling doe that will do anything and go anywhere for me, I want to pack with her. We regularly go on long walks. Shes tall, long and leggy(would this body style work?). How do I adjust a pack like this http://wolfpacks.com/products/dogpacks/saddlebags.html for a goat? I tried it on her and it fit, but would fall off one side to another. I was thinking maybe a butt strap? what material would be best? should it go around her rear legs as one strap or a strap for each leg? Thanks in advanced!