I recently purchased 3 of the assorted color Ziscs to play with my 5 dogs. Things we going well for a couple of weeks and it seemed even the big yellow lab couldn,t damage the Zisc. However, with his powerful jaws, he finally succeeded ripping the middle of it out. I have a feeling he will do the same to the remaining 2 so I put them up on the shelf and will continue to look for a different type that truly is "invincible".
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