I keep shar pei there from same family tree as the chow chow , if the chow is anything like the shar pei regarding diet id go out and get some books they'll be loads of info on google etc , try speak to some responsible breeders about diet requirements if you can they will know best as they need to keep there dogs fit and healthy
I feed my shar pei cereal free dry food along with fresh veg broccoli is good for cleansing the liver and kidneys , I also give him a fish fillet once a week either salmon or cod fillet mixed in with his food, red meat is a no no as they find it hard to digest and can damage there intestine, chicken is or but not to much as its very high in protein (there metabolism is very slow so low protein foods are best)
He occasionally has scrambled eggs
Hope this info helps you these are only my shar pei requirements im not sure if they all apply to the chow chow , good Luck with you new best friend