Get something without beef in it.. Get something with a decent pallate of foods... such as lamb, turkey, chicken, fish. Alot of dogs have beef alergies that cause them to act aggressive.. Cut out the cow hooves, and ears.. they have dyes, and also the hooves can have nails or rocks in them that can screw up a dogs teeth...
Stay away from dog food that has too much filler grain / wheat / corn fillers, it's ok to have in it, but not as a top main ingredient...
If you're really serious about your dogs health go to a organic pet food store, pay the extra cost, it will help your dog alot..
We feed our dog
Canidae Dog Food
My wife is a veterinary technician and has tried alot of different types of food and has had alot of reccomendations from her co workers..... Canidae comes pretty highly reccommended