My 8 month old pit bull has chewed through pretty much every thing i have given him within hours, and sometimes minutes. He played with this toy for pretty much 8 hours straight yesterday, and it looks to be holding up VERY well. The only thing he has done is tear off the "8" portion of the ball, which looks like it could make it weaker in the long run. This is just as strong as the Kong treat ball, which he also loves, but this is easier for him to keep in his mouth and bite down on.The only complaint, other than the 8 coming off, is the Orbee products come with tags attached, and even after cutting the plastic that holds them on there it leaves a potentially sharp object that could poke and pester not just the dog, but anyone dealing with the toy.