The pack we use is Outward Hound. It seems comfortable on him. I think the problem is that he is a large but skinny dog and no matter how I tighten the straps there isn't enough friction to keep the pack from sliding one way or the other. It doesn't seem to be a big deal though. Sometimes I just let it go off center and don't worry about it. I have thought about adding some sheepskin under the straps. My wife is handy in that department and so it could be possible. But would it help?

Howie