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K9 Select Melatonin Review (2026 Label)

Illustration — Comparing calming products

Published July 13, 2026 · Reviewed July 13, 2026 · By Best Melatonin for Dogs Editorial Team · Reviewed against the manufacturer label dated July 2026

K9 Select Melatonin is refreshingly simple: a single-ingredient tablet disclosing 3 mg of melatonin, with no proprietary blend and no extra actives. That transparency is its main strength; the trade-off is that it is melatonin only, with none of the supporting calming ingredients some blends offer.

Ownership disclosure: This website is owned and operated by Pure Majesty Pets, which makes and sells a melatonin liquid for dogs that we mention in our comparisons. We rank and describe products using their labeled ingredients and published research, not paid placement — but you should read our owned-product coverage with that relationship in mind. Read the full disclosure.

What the current label lists

K9 Select beef-flavored melatonin, active ingredient per tablet. Reviewed July 2026.
Active	Per tablet
Melatonin	3 mg

Because K9 Select is melatonin-only, it pairs naturally with a comparison against multi-active liquids. If you want melatonin plus supporting calming actives in one product, see how a six-active liquid compares in our best melatonin comparison.

Strengths

Single, clearly disclosed active — 3 mg melatonin per tablet, no hidden blend.
Straightforward for vet-directed melatonin use where a known amount matters.
Tablet format with a simple inactive list (e.g., dicalcium phosphate, liver, flavor, magnesium stearate).

Limitations

Melatonin only — no L-theanine, alpha-casozepine, or other supporting actives.
Fixed 3 mg tablet is less adjustable than a liquid for smaller dogs.
As always, the amount for your dog is a veterinary decision, not a weight-chart lookup.

Always screen inactive ingredientsActives are only half the label. Read the inactive ingredients and reject anything containing xylitol (FDA), especially in flavored or human products.

Read alsoCompare this against other products — see where it lands in the full, same-unit calming comparison.

Read alsoHow melatonin evidence actually stacks up — understand what melatonin does and does not do before choosing a melatonin product.

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

Pure Majesty publishes this six-active formula on its product page (labeled per 1 mL, updated July 2026); confirm the panel printed on the bottle you receive. Ingredient amounts describe what is in the bottle; they do not by themselves prove a calming or sleep outcome, and this exact six-active blend has not been tested in a published canine clinical trial.

See the current Pure Majesty label and product details

Frequently asked questions

How much melatonin is in K9 Select?

3 mg of melatonin per tablet, clearly disclosed with no proprietary blend.

Is a 3 mg tablet right for my dog?

That depends on your dog and is a veterinary decision. A fixed tablet is less adjustable than a liquid; see our dosage guide for why weight alone is not enough.

Does it have other calming ingredients?

No — it is melatonin only. If you want supporting actives like L-theanine, a multi-active product is a different option.

Sources

Merck Veterinary Manual. Toxicoses in animals from human antidepressants, anxiolytics, and sleep aids. Full review May 2025. merckvetmanual.com
VCA Animal Hospitals. Melatonin. Hamilton A, Gollakner R. vcahospitals.com
U.S. Food & Drug Administration. Paws Off Xylitol; It’s Dangerous for Dogs. Consumer update. fda.gov

Veterinary disclaimer. This article is educational and is not a substitute for professional veterinary advice, diagnosis, or treatment. Melatonin and calming supplements are not approved drugs for treating anxiety or insomnia in dogs. Always talk to your veterinarian before starting any supplement, especially if your dog is pregnant, a puppy, older, on medication, or has a health condition. In a suspected poisoning, contact your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661.