I fed my senior samoyed homecooked for a month before she died. Prior to this Rose had lost her appetite and when I introduced homecooked she loved it and showed great interest in her meals. I am not going to recommend diets as I think it depends on the individual dog what type of food, your dog's activity level, age, weight etc.
Do your research.
I can recommend a great book The Healthy Dog Cookbook by Jonna Anne with Mary Straus. Mary Straus writes about dog nutrition in the Whole Dog Journal (great magazine) as well as her website
www.dogaware.com.
For me it was rewarding to feed Rose a healthy diet, it was the least I could do for she gave so much joy and love in our household. Good luck.