Melatonin for Dogs Dosage Chart & Calculator
Melatonin is sold as a supplement, so doses are given in weight bands rather than mg/kg. The bands below are the ones commonly published by veterinary hospitals; they are usually given up to two or three times a day.
Enter your dog's weight to see the published reference range. Used for sleep problems, noise anxiety (fireworks, storms) and some coat conditions.
Human melatonin gummies and fast-dissolve tabs often contain xylitol, which is toxic to dogs. Read the label and ask your vet.
Warnings before giving Melatonin
- Supplements are not tightly regulated; strength can differ from the label. Choose a plain, single-ingredient product.
- Side effects are usually mild: sleepiness, upset stomach.
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Questions owners ask
How much melatonin can I give my dog?
Commonly cited bands: under 10 lb 1 mg, 10–25 lb 1.5 mg, 26–100 lb 3 mg, over 100 lb 3–6 mg, up to two or three times daily. Your vet should confirm the dose.
My dog ate a bottle of melatonin gummies. What should I do?
Melatonin itself is rarely dangerous, but gummies can contain xylitol. Check the label and call your vet or a poison line right away.