I LOVE Tux! Right out of the package ALL of my Dals were not only intrigued with it, but keep coming back to it until they were obsessed with it. And that's without any food inside! This is a great product and I'm thrilled to have something new for my dogs that they won't destroy in 10 seconds, yet enjoy day after day. The only problem is now I want to buy one for everyone I know who has a dog! Thanks, Tux designers!