You should not have to supplement prey model raw, except for maybe salmon oil if you aren't feeding fish. Its so much easier too because you don't have to worry if its all inclusive... doing the proper variety becomes second nature very quickly.

Ground premades are IMO not as good, you don't get the dental benefits and who knows what all they threw in there.... many have supplements thrown in already.

A lot of dogs require a tough love approach to get them to eat whole foods. It won't hurt him to get a little hungry and he won't starve himself.