Generally, dogs don't develop food allergies before the age of one year. I would look at other things first, but was he also itching on Fromm? What type of shampoo do you use? Joey's breeder said that the mistake most owners make is not rinsing enough, and she said that you should always use a conditioner, because it conditions the skin as well as the hair. Sometimes they shake because they are nervous, and sometimes it's because they are cold, but it could also be a sign of something more serious. Where is he scratching, all over or mainly his feet? Is he scratching his ears? I personally like to find a vet who will take the time and explain all my concerns to me. Itching one or twice a day for a moment, is normal, but if he's itching more than that you need to find a vet that will give you some answers. Is it possible he has fleas? Here are some things that can cause itching.
http://www.cesarsway.com/skincareawa...rgic-Reactions