skin care

Question
i have a 2 year old golden lab/ blue healer mix and she has been scratching perfusely at fleas or so we assume. she does have fleas she's an inside dog except to go do her business and she has chewed off her hair and skin to where she either has no hair or is blood raw and drawing blood i also have a chuahuah but no problems with her and fleas i've tried dip, medicated shampoo, flea shampoo, hartz flea drops that go on like the advantage does. and still she chews off her skin and hair. also she doesn't seem to have ever had a cycle unless she's immauclantly clean for  a dog or something else i don't know of please help. thank you leilani

Answer
If you think that there might be fleas, the use Frontline.  That is the best and longest lasting topical for fleas.  The dogs may need some help with their itching.  Ask the vet if these dogs can have cortisone to relieve the itching.
There may be other reasons for the itching and your vet will have to tell you that.