Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Durable, but Heavy, maybe a tooth breaker?

This ball is durable enough to not suffer punctures from my mini-Australian Shepherd who loves to herd a big ball. I ordered this one because it's hard plastic. That's the good news and bad news. It's pretty heavy for a 25 lb dog to push around. She's learning, but it's frustrating, so she jumps and bites at it. I asked someone who trains herding dogs about that and she said she had two dogs that broke teeth on these; one of those dogs broke a jaw. :( I'm going to see if I can get my pooch to push this around from underneath rather than trying to nip at it. I am now looking, again, for this size of a herding ball that won't be easily punctured by her sharp little teeth and won't break them either.