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I am sorry to hear you are worried about Dude. My name is Rebecca. I am a veterinarian and will do my best to help.
What symptoms are you seeing that make you think he has Lyme disease? According to one of the most respected experts in feline infectious diseases, we do not see Lyme disease in cats. There are tick borne diseases and flea borne diseases and viral diseaes we do see in cats that might have similar symptoms like fever, anemia, joint pain, weakness, etc.
I hope you were able to see my answer. Can I help with or answer anything else?