 40 years of practice, I don't think I've ever seen an issue with that kind of a toy. And by the way, since we're talking about rope, what is your opinion about dogs playing tug-of-war? Is it okay for their teeth? You know, it actually is okay for their teeth. We seldom see any harm coming from that kind of activity. You know, dogs sometimes will carry things in their mouth that are a little bit abrasive, and that can cause wear on the teeth, particularly tennis balls.