Bully sticks (Made in USA ONLY !!!!!!) are what we give our puppies, they love 'em. It keeps them busy. It really does work to "trade" your dog one thing for something else, as opposed to just taking something away !!! Makes sense.
Our pups growl but have never displayed any food aggression whatsoever. Work with yours as it is very important for them to understand that
YOU are the one who controls food/treats.
