VetIQ Calming Chews Review: Ingredients, Dose & Melatonin

Quick answer The current VetIQ Calming Support label lists, per soft chew, 60 mg chamomile, 60 mg vitamin B1, 30 mg L-tryptophan, 20 mg L-theanine, 20 mg passionflower and 0.25 mg melatonin. That is a low-melatonin, mid-dose formula sold widely at big retailers. Reasonable for mild, situational stress; not a fix for true separation anxiety.

VetIQ Calming Support

L-theanine: 20 mg
Melatonin: 250 mcg
L-tryptophan: 30 mg
Thiamine (B1): 60 mg
Chamomile: 60 mg

Also: passionflower 20mg

Chews per day by weight: 0–15 lb: 0.5 · 16–30 lb: 1 · 31–60 lb: 2 · 61–100 lb: 4 · 101+ lb: 5 · 90 per jar

Check on Amazon

Per chew, from the manufacturer label. Check the package before buying; formulas change.

The formula changed: check your bag

VetIQ (styled Vet IQ on the maker's site) has revised this chew. The label we read on the maker's product page on October 11, 2026 lists melatonin and passionflower. Older retail listings and many older customer reviews describe a lavender-based formula with no melatonin. If you are reading VetIQ calming reviews online, many of them may describe a different product than the one now on the shelf.

Turn the bag over before you buy or give it. If the supplement facts panel lists melatonin 500 mcg per 2 chews, you have the current version described on this page.

What is in each chew

The label states amounts per 2 soft chews (3.5 g). We halved them for a per-chew view.

Active	Per 2 chews	Per chew	Evidence in dogs
Chamomile	120 mg	60 mg	Weak; mostly traditional use and rodent work
Vitamin B1 (thiamine)	120 mg	60 mg	Weak; little controlled canine data
L-tryptophan	60 mg	30 mg	Mixed; mostly diet-level studies with small effects
L-theanine	40 mg	20 mg	Modest; a few small canine trials
Passionflower	40 mg	20 mg	Very limited in dogs
Melatonin	500 mcg	0.25 mg	Used by vets for noise fear and sleep; mostly clinical experience

How each one is supposed to work

Melatonin is a sleep-related hormone. At 0.25 mg per chew the dose is low next to many competitors. See our melatonin page.
L-theanine is a green tea amino acid linked to relaxation without heavy sedation. The 20 mg per chew is on the low side. More on our L-theanine page.
L-tryptophan is a building block for serotonin. Most dog research involves diets, not small supplement doses. See L-tryptophan.
Thiamine appears in many calming chews, but the dog evidence is thin. See thiamine and colostrum.
Chamomile and passionflower are botanicals with a long history of use and little controlled data in dogs. See chamomile, valerian and other botanicals.

How to give it

The maker's directions are by weight. The product page says there is no minimum age, but dogs should weigh at least 5 lb, and it advises asking your veterinarian first.

Dog weight	Label amount	Melatonin per day	90-count bag lasts
5–15 lb	1 chew every other day	0.25 mg on dosing days	about 180 days
16–30 lb	1 chew daily	0.25 mg	90 days
31–60 lb	2 chews daily	0.5 mg	45 days
61–100 lb	4 chews daily	1 mg	about 22 days
100+ lb	5 chews daily	1.25 mg	18 days

The directions are written as a daily (or every-other-day) amount, not as a one-off dose before an event. Many owners use calming chews ahead of known triggers such as fireworks or car rides; if you plan to do that, ask your vet about timing and amount. Large dogs go through a bag quickly, which matters when you compare cost per day.

Is VetIQ a good brand?

Here are the checkable facts. The maker's product page names PetIQ, LLC as the company behind Vet IQ. The chews are described as made in the USA with globally sourced ingredients and cold-formed. VetIQ also sells an Advanced Calming chew for dogs; this review covers the standard Calming chew. The brand also sells a separate cat calming chew, a crunchy-outside, creamy-center treat that lists melatonin, GABA and valerian root among its actives; that product is not covered here.

We did not find a NASC Quality Seal mentioned on the dog calming product page we read. That does not prove the seal is absent from the packaging, so check the bag if it matters to you. Whether the brand is a good fit depends mostly on whether this specific formula and dose suit your dog, which is a question for your vet.

Does it work?

We are label researchers, not veterinarians, and we found no published clinical trial of this product. Its ingredients each have some research behind them, but most of that research used different doses, different products, or other species. The fair expectation is a mild effect at best, more likely for situational nerves (visitors, grooming, short car rides) than for panic, aggression or separation anxiety. Those problems usually need a behavior plan and sometimes prescription medication.

What to watch for

Drowsiness. Melatonin can make dogs sleepy, especially at the higher counts given to big dogs.
Stomach upset. Soft stools or vomiting are possible with any new chew, and more likely when giving several per day.
Interactions. Ask your vet if your dog takes anti-anxiety drugs, sedatives, seizure medication or anything serotonin-related, since L-tryptophan and melatonin may add to their effects.
Who should skip it without vet advice: pregnant or nursing dogs, dogs under 5 lb, dogs with diabetes, and dogs with liver or kidney disease.

A note for small dogs

A 5 lb dog on the label amount gets 0.25 mg melatonin every other day, or 0.05 mg per lb on dosing days. A 30 lb dog gets about 0.008 mg per lb daily. Small dogs get far more melatonin per pound, so confirm the amount with your vet. Our small-dog guide compares options.

Alternatives to compare

Finn Calming Aid: 1 mg melatonin and 25 mg L-theanine per chew, plus valerian and passionflower. Four times VetIQ's melatonin per chew.
NaturVet Quiet Moments: a long-running melatonin chew; see our Quiet Moments review.
ThunderBites Calm + Probiotic: 1.5 mg melatonin per chew, six times VetIQ's amount.
Melatonin-free chews for dogs that get groggy or take interacting medications; see calming chews without melatonin.

Sources

Frequently asked questions

Do VetIQ calming chews have melatonin?

The current label does: 500 mcg per 2 soft chews, or 0.25 mg per chew. Older versions of VetIQ Calming Support used lavender and listed no melatonin, so older reviews and some listings may not match. Check the supplement facts panel on your own bag to see which formula you have.

How many VetIQ calming chews can I give my dog?

The label says 1 chew every other day for 5–15 lb, 1 daily for 16–30 lb, 2 for 31–60 lb, 4 for 61–100 lb and 5 for dogs over 100 lb. Dogs should weigh at least 5 lb. The maker advises checking with your veterinarian before you start.

Is VetIQ a good brand for dogs?

VetIQ is a PetIQ, LLC brand sold widely on Amazon and at large pet stores, and its calming chew is made in the USA. The calming formula uses common ingredients at modest doses. Whether it suits your dog depends on size, health and current medications, which your vet can assess.

How long does a bag of VetIQ calming chews last?

Following the label, a 90-count bag lasts about 180 days for a 5–15 lb dog, 90 days for 16–30 lb, 45 days for 31–60 lb, about 22 days for 61–100 lb and 18 days for dogs over 100 lb. Big dogs use it up quickly, so compare cost per day.

Can VetIQ calming chews make my dog sleepy?

Yes. The current formula contains melatonin, which can cause drowsiness, especially in larger dogs taking 4 or 5 chews a day. Stomach upset is also possible. If your dog seems unusually lethargic, wobbly or unwell, stop the chews and contact your veterinarian.