I was wondering if anyone here uses a backpack on their dog? Is it actually beneficial to your dog or is it more beneficial to the owner (it would be kind of nice to have someplace to put stuff on walks instead of in my pocket)? I have been toying with the idea of getting a backpack for Cubby to wear while out on walks, but have been wondering if they are worth the money.... If they are worth it, does anyone know of a good brand or site that you would recommend? Thanks!!