My miniature schnauzer and my airedale terrier both really love it. It takes them a long time to finish, but they really enjoy it. The sticks inside are relatively large, so I’d recommend it more for bigger or persistent dogs.
My 7kg puppy has an incredible jaw grip and eats everything really quickly, but this treat turned out to be not only difficult for him and kept him busy for about half an hour, it was also so exciting for him that he didn't notice anything else around him. I'm planning to buy it again.