My "blue lab" Rocky (blue heeler and black lab mix) finally was able to put a small tear in the Zisc, but only after 6 months of playing with it (hard- for over an hour a day), sleeping with it, gnawing on it, and general abuse that limited all other frisbees' life spans to mere days or hours. We play fetch by the river's edge every day while I get my walk in, and he goes swimming even in winter, wades out to get a drink, keeping one eye on his Zisc the entire time. Even the red cloth frisbees don't stay on the surface once they are water-logged, and they turn to ice in the cold weather. The Zisc does get a bit slimy (okay, a lot slimy) more quickly than some toys, but I figured out that a glove with textured palms (like a gardening glove or "monkey grip" glove) will allow me to keep control, plus keep my hand clean and warm for dozens, even hundreds, of throws! When Rocky tires of fetch (not often) he likes to tug-o-war for variety, and if I'm feeling loose and strong, I can pick him up off the ground and spin him around (all 90 pounds, ughh!) until we both collapse from dizziness and exhaustion. He was doing the same thing to his favorite girlfriend, Echo (a smaller lab mix), yesterday when I noticed the small tear. Those two will latch onto the Zisc and take turns dragging each other around, not letting it loose for 20 to 30 minutes sometimes. Then they fight over who gets to use it as a pillow while they catch a power nap! Of course the Zisc is heavier than the average frisbee, so I've learned to alter my throwing technique so that I can keep throwing every day without pain (mainly a longer sweep of the arm, without so much snap of the wrist and elbow) and can get pretty good distance and accuracy, no matter what the wind conditions. Rocky and Echo don't have any trouble catching the disc in their mouth, and I believe the Zisc needs the higher than average side wall to create enough of an air pocket to hold it aloft, since it is heavier. I'll order a couple more Ziscs now, and use the torn one for a back-up in case of emergency! Thanks for a grrrrrrreat product!