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Hello, I'm Dr. Bob. I'm sorry to read of Milo's condition, and I agree with you that this is far too early to give up on him, especially in light of the recent improvement. Cancer in a dog 3 years of age is extremely rare and, unless I actually saw the laboratory report identifying bovine strep as the cause of the infection, I would be highly skeptical of that diagnosis. (Google "bovine strep in dogs)
I would encourage your mother to immediately seek a second opinion, smething is not right about this situation as you've described it. If I can be of any further assistance, please let me know.
Kind regards, *****
Hello again! Yes, I definitely agree that Milo needs more time to allow his body to try to fight off whatever is causing his symptoms. A test for Ehrlichiosis is a very good idea. If this would be Ehrlichiosis, a simple titer test would prove it one way or the other. You can read a number of excellent articles about Ehrlichia online by googling "Ehrlichiosis in dogs". Joint pain and swelling may only manifest later in the course of the disease, if at all.
The antibiotics most effective against Ehrlichia are tetracyclines and doxycycline. Unless one of these are used, Milo will not improve, and his condition will continue to deteriorate in the long term. Kidney failure is a very real possiblitily unless the disease is properely diagnosed and treated. Perhaps after studying up on Ehrlichiosis you'll be able to persuade your mother and father to ask for the test to be performed. It could very well mean the difference between life and death for Milo. Please let me know if you should have any further questions, I'll be more than happy to answer them for you. Best regards, *****