Dog Training Treat Bag, Ideal for Obedience Agility Puppy Classes Convenient Durable. Dog Training Treat Bag is easy to use. The spring opening stays open for easy access. Closes with one push, no little treats spilling out. Holds 2 cups of treats. Comes with 50" belt, mesh pocket to stow your stuff, a key ring and a hook. Washable in cold water. Tough and durable We have been told it is dog-proof _ guess it depends how big and determined your dog is!