First of all, dog training isn't something you can do once and then forget: Even if your dog can learn everything she needs to know in a week, she's not going to retain much of it if you don't keep practicing with her. When you feel you have achieved a well-trained dog, continue to practice obedience exercises once in a while. They also can make mistakes. Give the dog one to two teaspoonfuls of mineral oil and call your veterinarian. Your pet will become extremely sensitive to other substances.
You will also be changing up the number of times that feeding will take place.
You also have a habit of stopping your car at a red light. Concentrate on the warmth and sense of belonging you have given your dog throughout his life, and the gift of relief you are now bestowing upon your suffering pet. All breed of dog can be affected by Dermatitis. All dogs are prone to some type of dog disease as they approach their older years in life.
It may make the problem worse.