My 2 Pit Bull mixes love these balls. This is our second one---nothing happened to the first except that I left it outside so much that it got really dirty so we needed a new one! Not a good option though if you have a chewer. We only play fetch outside with this rather than leaving them with it to chew.
Love these toys by meddy from South Lyon, MI11/11/2013
My dogs have been raised on holee rollers with balls stuffed inside. They love them.