We have a few bags of mulch left over. It has no dye in it at all, it is animal safe cuz we have dogs that like to lay in it! We were wondering if it would b ok to put in the run? We use straw and pine shavings in their coop. My teens are 15, 16, & 17 weeks old. They have already desecrated the grass in the run and we have put down some pea gravel to keep it from becoming a muddy mess. So what r the opinions of using the mulch in the run?