I hear ya! I can't guarentee that he can't eat the string, but I can tell you that both of my kitties are British Shorthair (i.e., strong, "cobby" builds) and although they like to grab the string and hold it so the motor strains and the string can't whip in-and-out... the string has stayed attached to the toy.
I'm not sure I would trust it to stay out and for them to play unsupervised, but otherwise it appears to be well made and sturdy.
Hope this helps...
answered 7 months ago
1out of 1found this answer helpful.