My 10 year old Westie suddenly developed dermatitis on her back last summer. I started giving her a daily dose of EfaVet 330 and within 2 weeks her dermatitis was almost cleared up! I carried on with the Efavet 330 for another 6 weeks and changed to Efavet Regular and the dermatitis did not return. I was thrilled. Her fur has grown back to its usual thickness and I am still giving her Efavet Regular on a daily basis.