Our GSD Macgregor from rescure came to live with us at 10 months.  He suffers from seperation anxiety and has many other issues.  Mac has a choice of 3 Huck's, and 2 Tux's, with his preference for the Huck's.  Some have a few wear and tear (chewing) marks but they have outlasted his chewing frenzies when he is anxious.  We are thrilled with this product and its American made and eco friendly to boot.   As long as Mac has a Huck or a Tux in his mouth, he has peace within.  Thank you!