Ehrlichiosis?

Reuben i can tell you this we took this same dog in a year ago and they claimed hook worms was his deal at the time i was using safeguard and valbezen alternating 1st vet says yea got bad hook worms. Ok i buy that he does a blood transusion and gives me a big bottle of stongid to use for all my dogs.I use it and give my safeguard away and get a boottle of pyrantle proamate and start alternating between the 2. He goes back down hill we take him to another vet and they claim hookworms agian and perscribe drontal and yet agian i buy it.All the while iv changed dog food 2 times goin from purina which the dog was raised on he quit eating it we tryed 1 bag of retriever didnt like it he ate it ok went to victor purple bag he felt awsome on it a couple months then went way down hill agian. He has had no energy crud in his eyes craps brown liquid lost 6 pounds and at his fatest only weighed 23. My wife loves this dog the bad thang is hes a cronic id rather move a lacy in the yard but wats a man to do other then pay the bill and keep her happy.