I have a pit-ridgeback mix who regularly made short work of the Kong frisbees (so much so, that I'd buy 3 at a time). I gave the Zisc a try and it felt more durable and lasted much longer than the Kong discs did. I think it would've lasted even longer were it not for the raised logo on top which constantly provided a place for his teeth to catch--it's along the logo were the first tears/holes appeared. Once they were there, they just grew. This is the best I've tried so far, but will probably keep looking.