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Melatonin Dosage for Dogs by Weight (AU)

Illustration — Liquid supplement dropper and a dog

Published July 13, 2026 · Reviewed July 13, 2026 · By Best Melatonin for Dogs Editorial Team

If you want a melatonin amount for your dog by weight, the honest answer is that weight alone is not a safe dose. Even though melatonin supplements are sold over the counter in Australia, the right amount also depends on the reason for use, your dog’s age and health, other medicines, and the exact product concentration. Follow the product directions and confirm with your vet.

Ownership disclosure: This website is owned by Pure Majesty Pets, which sells a melatonin liquid supplement for dogs mentioned in our comparisons. Read owned-product coverage with that in mind. Full disclosure.

Why we do not print a fixed chartA number copied without your dog’s medical context is how accidents happen, and products differ in strength. Use this to talk to your vet and to read your product’s label — not to self-dose.

What a vet weighs

Body weight is one input among several: the reason for use, age and life stage, health conditions, other medicines, and the exact product concentration. See the full explanation in our detailed dosage guide.

Concentration matters

“3 mg” means different volumes in different products. A liquid at 3 mg per millilitre is not the same as a 3 mg tablet. Always match the number to the unit on your product.

Read alsoIs melatonin safe for dogs? (Australia) — confirm suitability and see the Animal Poisons Helpline first.

Pure Majesty Pets Melatonin for Dogs — labeled actives per 1 mL

Manufacturer-supplied formulation, current as of July 2026
Active ingredient	Per 1 mL
Melatonin	3 mg
L-theanine	50 mg
Alpha-casozepine	25 mg
Water-soluble chamomile extract	25 mg
Elemental magnesium	5 mg
Vitamin B6 (as P5P)	0.5 mg

Manufacturer-supplied formulation for Pure Majesty Pets Melatonin for Dogs, published on the product page and current as of July 2026. As a companion-animal supplement it can be used to help support calmness in healthy dogs; the amounts describe the contents and do not by themselves prove a calming or sleep outcome, and this exact six-active blend has not been tested in a published canine trial. Confirm availability and shipping to Australia before ordering.

See the current Pure Majesty label and product details

Frequently asked questions

How much melatonin can I give my dog in Australia?

Weight is only one factor, so this should be confirmed with your vet, and you should follow the product’s own directions. Do not rely on an online chart alone.

Is there a dog melatonin dose chart?

We do not publish a chart that outputs a dose, because a number without your dog’s full context can be unsafe. A vet weighs indication, age, health, medicines, and product strength.

Can I give my dog 3 mg of melatonin?

Whether 3 mg is appropriate depends on the dog and cannot be judged from weight alone. Confirm with your vet and follow the product label.

Sources

Niggemann JR, Tichy A, Eberspächer-Schweda MC, Eberspächer-Schweda E. Preoperative calming effect of melatonin and its influence on propofol dose for anesthesia induction in healthy dogs. Veterinary Anaesthesia and Analgesia. 2019;46(5):560–567. doi:10.1016/j.vaa.2019.02.009
VCA Animal Hospitals. Melatonin. Hamilton A, Gollakner R. vcahospitals.com
Merck Veterinary Manual. Toxicoses in animals from human antidepressants, anxiolytics, and sleep aids. Full review May 2025. merckvetmanual.com

Veterinary note (Australia). This is educational information, not veterinary advice. Melatonin calming supplements for dogs are sold over the counter in Australia as companion-animal supplements; your vet can also advise on use or arrange a compounded product where appropriate. Talk to your vet before use, especially if your dog is on medication or has a health condition. For a suspected poisoning, call your vet or the Animal Poisons Helpline on 1300 869 738 (a free 24/7 service).