I wouldn't want my dogs ingesting any chemical compounds that might be in tires seems like a bad idea to me.
Well ... of course "Training and Exercise," is important! But it's not enough?? We had the old exercise cures all "debate," on GSDForum, quite often. And I "off course," was on the "Exercise Does," not cure all?? Now where I live now, I am lucky! Ton's of "open Space! I could "now," drive about quarter mile from my house, open the door and say "OK." And my dog's could you know run as long as they want! So for me "Exercise," was a piece of cake! But even still if I had company come ... they were kinda off the hook?? So I still had stuff to learn??Training and exercise