Not invincible
Ball looked and felt really good and Socks loved it BUT after 20 minutes she had ripped the rubber by the hole. Either the hole is too big (so she could get her teeth in)or it is not re-enforced enough for a dog who loves to chew. I was really disappointed as the idea is good and otherwise it seems really sturdy. I must say that Zooplus customer services were 100% helpful. Thank you.