I have an 8 year old male Jack Russell that can't stop itching. We have been battling this for several years now with little help from the vet. I have used both Frontline and Advantage on him for fleas. I don't notice the fleas as much but he constantly has the urge to scratch. So badly that he has rubbed raw, bleeding spots on his back. He will scratch on anything he can. Does anyone have any suggestions? Is it safe to give him benadryl pills and if so what type of dose?? My poor baby is miserable and so is the family.