I have One Rabbitin the Barn who lovesthose freezer packs that are made forIce chests , the Big blue ones, Now She doesnt chew on itat all so be sure tocheck constantly so they arenot chewing on them , She loves to layher chubby tummy flat on thesurface when itsreally hotinthe garage . You can try oneof those also but as Isaid watch them closely ,Forthe ones I dont trust to chewon those packs I givefrozen 2 ltr bottles of Ice ,they love it , they will scratch ,dig nudge flop downbeside and play sillygames with the bottles , Iwould try them before theIce packs I also havethe small Icy bottles for thesmaller breeds , for them I usecoke or water bottlesfilled and frozen . keep inmind hte smaller the bottle the moretimes it will need to be replaced. hope this helps .