I have a two-year-old yellow lab named Lili. This is above all her favorite toy! She takes it everywhere- even on walks! She gets so excited when we get out the Zisc that she isn't even distracted away from it with prime rib! The only reason it doesn't get 5 stars is because when left outside the center becomes weak, allowing excited Lili to cause little bite marks which with time turn into rips. BUT I will say it does last longer than any other frisbee I have purchased for her. I will continue to purchase the Zisc regardless of flaws because of the abundant happiness and exercise it brings Lili. Thank you for making such wonderful environmentally friendly products. You have made me and Lili very loyal and satisfied customers.