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Hello. Thanks for the question.
Methamphetamines should not cause hair loss and itching. They typically cause acute onset neurologic signs- agitation, excitation, muscle tremors, seizures and vomiting. They typically take effect quite rapidly and can last for 24-48 hours. We treat these dogs with IV fluids to flush the drug and sedatives (Acepromazine) or anti-seizure meds (Diazepam/ Valium) as needed for the signs.
I would guess your dog has a flea allergy or environmental allergies based on the signs you are seeing. Skin mites would be another potential cause. I would get a dermatology work up with your vet to figure it out.
I hope this helps, let me know if you have any other questions.