Is the dog consuming alcoholic beverages or any form of drugs? Prescription/illegal, etc? That might be why the veterinarian didn't give you the medicine or a prescription or even the name of it.
What is your dog secretly up to? Do you know and are aware or is this all a shocking and surprising mustering mystery in this case?
If the dog is a teenager he might be suffering from a combination of angst, rebelling and substance abuse.
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