We purchased a Zisc from Bone and Biscuit in Ajax, Ontario, after previously purchasing a Bumi pull toy there as well. Our mix breed shepherd hound puppy has tore through and destroyed more toys than I care to mention, however after hours of play with both the Zisc and the Bumi, they don't even have teeth scratches on them. She has been trying to chew the emblem off the centre of the frisbee (which is the thinnest part), but she has yet to damage the product at all! These are fantastic products and I highly recommend them to anyone with a dog. I will be a loyal purchaser of these products.