For every brand of dog food, there are fifteen opinions on it, its quality and whether you should feed it to your dog. I strongly urge you to hie thee to a knowledgable person, the library and the Internet.
Educate yourself on what your dog needs to be healthy, alternatives for dogs with allergies, common foods that are toxic to dogs and what the real scoop is on homemade vs. commercially produced, if you’re leaning to home cooking.
Ask what other people are feeding their dogs and see if their dogs are healthy and happy. Ask your vet, ask your breeder, ask people at the local kennel club or the local pet supply store. Keep in mind that every one has their biases and do your own research.
Treats are great motivators for Shibas of all ages. You can buy them at any pet supply store. Or make your own. Shassi used to bait beautifully for hotdogs.