dog pack

seems like a great pack so far and has far more capacity than she will ever use. She ran with it, tromped through snow. however, the sizing is difficult. her chest size and length is large because she's a lab. where the belly strap hangs (south of her big rib cage) she's probably a medium or small. we have the strap as short as it will go and without enough weight in the pack, it still slides to one side or the other.