Is it healthy for dogs to eat chicken everyday?

My dogs get bored of their food easily, so I am thinking about switching to a all-chicken diet for them. I am planning on giving them boneless, skinless plain chicken. I would just boil it in water, until cooked. Is this healthy for them? I have a german shepherd and a pitbull who are picky eaters. My beagle and Chihuahua will eat their normal dog food.