Although it's best practice to always supervise your puppy, I would not advocate for this as a crate training tool. Both of my puppies were easily able to bite off pieces of groov during its first use. Although the design is great in concept, not great for any puppy who is teething. I am disappointed that it ended up being a single-use item. Very expensive to buy two only for my puppies to bite through and essentially try to eat the pieces of silicone.