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My 15-pound dog ate 5mg melatonin. Is this dose dangerous for him?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 1 year and 1 month old | 15 lbs

My dog is 15 pounds and ate 5 mg melatonin

1 Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on August 25th, 2022

That is quite a large dose for a dog that small. While it may just make Max very drowsy, it is best to seek out care ASAP in the event of a large dose or if Max is acting ill. Signs to watch out for include vomiting, diarrhea, and lethargy/confusion.

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