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The dose of diphenhydramine goes by the dog's weight, not it's age. The standard dose is 1 mg per pound of weight, every 8 hours. For a 20 lb. dog, the doese is 20 mg of diphenhydramine.

If you think your dog is having an emergency, call your vet's office. Don't wait for help from any internet helpline.

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12y ago

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