Sadie and Pooh Bear have been scratching, biting and itching for over a week now. I have been giving them their Tavist alergy pills as the vet has recommended in the past. They take Tavist every day, and take 2 a day when real itchy. Sadie has her behind area all raw and bleeding in spots. She is worse thatn Pooh. She has broken out areas and sores on her tummy, and behind area. I have them both on Frontline. Sadie has had bad allergies all her life. In the past when she is like this our vet will put her on an antibiotic and calls this a skin infection. I think this is what she has. We have a bottle of Cephelexin that was Pooh Bear's but it made him throw up. Sadie has had this before and does fine. Since it is Sunday and she is so bad I thought about starting her on this Cephelexin and follow up with her vet tomorrow. What do you all think?