I would ask my vet or a reputable groomer what should be done - ruling out a skin condition first. By the way, I also have very sensitive skin - but allergy testing revealed I am extremely sensitive to products formulated for sensitive skin. So use of sensitive skin products gives me a rash. Food also is an issue of course - you have to find out if it is a cause and exactly which foods your dog has a problem with. My dog is sensitive to corn and wheat, but really only for digestive purposes - way too much output. He is now just over a year and we have had him on food that works for him for 4 months now. But while on puppy food and his first batch of adult food, it was only his digestive system that reacted to these ingredients. His skin and hair were and are fine.