We use Royal Canin L/S 14 which is a prescription food but has been working very well for us. If your vet doesnt carry it petsmart does. Your vet just needs to call in the prescription and they give you a card there for it. For treat I give my babies fruits and veggies... mostly fruit though. Check out the yahoo LS group, thay have really kept me sane when I thought I was losing it
You will be able to have tons of info on this too.