Duct tape by 3M, not the wannabe stuff.
Contact paper, 550 paracord, spray expanding foam, and several boxes...
My kids used to hide biscuits like that from our dog. In several boxes. LOL! Our poor big sweet German Shepard Collie mix. The dog knew if he ever bit any of the boys, he would get sent straight to the pound, so my kids tormented him just like you were talking about. The dog also got his share of wedgies. LOL!! They would dress him up in an old t-shirt and pants. LOL! But he was like part of our family. We really loved that dog. And he was never hit or treated poorly except for the loving pranks. LOL! He was always well fed and kept warm and safe.