"I have a golden/lab mix and he's a really big boy, he weighs in at 150 lbs and he's not fat, just pretty large for a retriever. At any rate, we all know how much retriever's love to chew and he has never worn out a Kong, by the time they start to wear at one end he ends up losing it in the woods, I'd say the avg. lifetime of a Kong with us is around a year or so before he loses it, and I think it would last nearly 2 years before falling to pieces which is great for him. Also great to stick treats in to keep him occupied when he really needs to do something and I can't take him out. We've tried lots of toys and none are as fun or as durable for us as the Kong! It's definitely worth a try for any chewer."