What Is The Healthiest Kind Of Dry Dog Food For Small Dogs?

I have heard that you should feed your dog dry food, because it keeps their teeth strong (not sure if this is true). My dog really loves the wet, meat with gravy kind of food, but he will also eat dry dog food. I usually put a little bit of beef stock over it to flavor it up a little though. Any suggestions on a certain food? My dog is a 9 month old Maltese.
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