What about a home cooked diet? Next best thing to raw and usually recommended over raw for elderly dogs or dogs who have compromised immune systems.
I feed mostly raw, but also make some pressure cooker meals, especially in the winter. You can cook down bones to where they become brittle enough to feed cooked.
Throw a whole chicken or rabbit in the pressure cooker with some water, towards the end add veggies (optional, I like feeding veggies). Make sure the bones can be crushed easily with a spoon. Save the broth- it makes a great joint supplement.
ADCH Mikko (USDAA) SCH-B; (NADAC) EAC, EJC, TN-E, TG-E, VerO; (AKC) NAJ, CGC; (NACSW) NW1 - 9 year old GSD