To be honest, I had my doubts about how long these toys would last my bull terrier. I have spent hundreds of dollars on so many different toys and always been told that they are bull terrier proof, and there is no way that my dog would be able to destroy them, only to have to throw them away after only a few minutes of him playing with them. We gave my dog these toys on Christmas day, and seriously he has not stopped playing, throwing, squeaking and chewing these and there is still absolutely no sign of any wear and tear. My dog loves toys and up until now he hasn't really been able to have anything to play with because he destroys everything, and now it it amazing to see him so happy, running around with these toys. I bought both Chester and Harold and while he plays with both, I really think that Chester is his favourite, only because it fits in his mouth better and he finds that one easier to squeak.