My two rabbits are six months old and until fostering three other rabbits, I hadn't realized they don't really. Go thru hay as fast as I hear they should, they are six months old. Both altered. When I pet them I can feel their vertbrea. Is there something to help bulk them a bit?. Tbey chew on baseboard, door frame, corner doors. Not the chews. I buy and don't seem that ravenous in hay, its a mixed oxbow Timothy and orchard grass, as well as their offered pellets with wild flowers mixed in.