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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear you are worried about Max.
I agree this could be fleas; being allergic to fleas and flea bites is the most common cause of dogs having twitching along the spine when they are petted.
Tea tree oil would not eliminate fleas; you need to use something like Advantix, Frontline, or the Seresto collar. For a more "natural" treatment I recommend Buck Mountain parasite dust.
Tea tree oil can be toxic to dogs, causing temporary paralysis and other symptoms:
I would try a safer and more effective flea treatment, and see if that helps. Let me know what other questions you have.
I hope you were able to see my responses; I have not heard back from you! How is Max doing?