My Lab/Greyhound is a fetching maniac. She needs about an hour of intense exercise per day, and playing fetch is her favorite. She gets very excited and tends to really gnaw on the toys as she's returning them to me. She destroys normal frisbees in the first few throws. Tennis balls might last a day before they're deflated and another before they're destroyed. You can actually hear them "pop" in her mouth as she's carrying them. I was given a Kong Flyer for Christmas. We started using it every day approx March 15 when the weather broke. It's been played with every day since, and it's now September 10. This toy shows no sign of wear. No bite holes, no tears, no damage. My dog usually leaves this toy on the deck or in the back yard when she's done and it shows no sign of degradation from the sun either. This is a fantastic dog toy. I ordered another to keep at my parents for when we visit. I will probably get another just to have a spare.