My dog loves, loves, loves tennis balls, the way most dogs love bones. I generally have to give him a new one every couple of days. Thats why I have to buy in bulk. He starts by ripping the fuzz a bit and popping it within minutes of receiving one. He loves catch of course, and gets a few fetch sessions in before systematically destroying the ball, piece by piece. When he reaches the point where one half of the ball is in pieces, we call it a "ba". Anyway, when these balls showed up, we were excited to see his reaction. They are so durable that it took him a good hour to pop it. And he hasn't gotten to "ba" status yet, and it's been weeks! He gets frustrated because it's super hard to tear the little pieces off. I would definitely recommend these balls, as they are very well made. I know most people use these balls for a completely different purpose, but they dont see the actual construct of it. Dense and springy. Very nice bounce to them. I dont know if I will need to buy more for a very long time! Mickey is a happy customer:)