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I am sorry to hear you are worried about Ark. I am a veterinarian and will do my best to help.
100 mg of doxycycline twice daily would be a good dose for a 22 to 44 pound dog; how much does he weigh?
Have any blood tests been done?
If Ark is 34 kg, the dose of doxycycline would be 300 to 400 mg of doxycycline once to twice daily.
You can still do blood tests for tick disease, even after starting treatment. We test for antibodies against the pathogen, not the actual pathogen. If he is making antibodies against a particular tick disease, he will still have antibodies even after being treated.
Always give doxycycline with food never on an empty stomach.
I have had dogs take this dose of doxycyline ( 10 mg per kg of body weight once to twice daily) for years, even longer. Dogs livers are just as strong as ours, unless he has a liver disease or condition.
You can stay in touch, but only in this format. Please do let me know how he is doing.
Kindly consider rating my answer. You can still get back to me with updates after rating. I hope he starts to get better soon. Rebecca