I found this online from a veterinarian forum: "Doxylamine can be used as an antihistamine for itch relief in healthy dogs on no other medications, at a dose of 1/2 to 1mg per pound of body weight, as often as every 8 hours."
Im not sure what your lab's allergies are, but there are online veterinary services if you have additional questions and can't get to your vet.
- Doxylamine Information for Consumers
- Doxylamine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Doxylamine (detailed)
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