Hello. I have an 11 year old Yorkie, Suki. She has developed a red rash on her tummy - I've been to the vet. He said maybe allergic to grass but she hasn't been on grass for months. She's been on a raw food diet her whole life -- and nothing new has been added to her diet or activities. Can anyone suggest perhaps a home remedy for her rash? She is constantly licking and biting the sore. I was bathing her sores every night with a mix of baking soda water but no marked improvement. THANK YOU.