Pick up three tubs of calming chews in any pet shop and you’ll find the same handful of ingredients on all of them. Valerian. Chamomile. L-theanine. Something called a proprietary blend.
What you very often won’t find is how much of any of it is in there.
That single omission is the difference between a product that might do something and one that’s mostly liver flavouring with a herb list on the back. It’s worth knowing how to tell them apart, because the price doesn’t reliably tell you and neither does the packaging.
The proprietary blend problem
Here’s the trick, and it’s entirely legal.
A label can list valerian root, chamomile, lemon balm, passionflower and L-theanine under a heading like “Calming Complex – 250mg”. That looks generous. What it doesn’t tell you is the split. It could be 240mg of chamomile and 2.5mg of each of the others. You have no way of knowing, and neither does your vet.
Ingredients are listed in descending order by weight, so the first-named is the largest component. But without quantities you can’t tell whether the active ingredients are present at a meaningful level or as what the trade politely calls fairy dusting – just enough to justify the claim on the front.
A product that states each active and its exact milligrams per chew is telling you something. One that hides behind a blend name is usually hiding something.
So the first thing to check on any tub of Calming Treats for Dogs is whether you can find a per-chew breakdown. If you can’t, put it back. Everything below only matters if you know how much you’re getting.
The ingredients with something behind them
L-theanine. An amino acid from green tea. It’s among the better-studied calming ingredients in dogs, with published work suggesting it supports a relaxed but alert state rather than sedation. Typical inclusion sits somewhere in the 20-50mg range per chew for a medium dog.
Alpha-casozepine. A peptide derived from milk protein, and probably the ingredient with the strongest veterinary evidence base of the lot. It’s the active in several prescription-adjacent products and there’s reasonable clinical data behind it. Less common in everyday supermarket chews because it costs more.
L-tryptophan. An amino acid the body converts to serotonin. Evidence in dogs is mixed rather than absent – some studies show an effect on anxiety-related behaviour, others don’t. Worth having, not worth choosing a product for on its own.
Magnesium. Supports normal nervous system and muscle function. Unglamorous and frequently overlooked. Look for a chelated or citrate form rather than oxide, which is poorly absorbed.
Thiamine (vitamin B1.) Turns up in a lot of calming formulations. The rationale is sound enough – B vitamins are involved in nervous system function – though it isn’t doing the heavy lifting.
The botanicals
These have long traditional use and thinner clinical evidence in dogs specifically. That doesn’t make them useless; it means the honest position is “widely used, plausible mechanism, limited canine trials”.
Valerian root. The most common calming herb there is, used in humans for centuries for sleep and relaxation. In dogs the evidence is largely observational. It has a distinctive smell that some dogs love and some refuse outright.
Chamomile and lemon balm. Both gentle, both traditionally associated with relaxation and settled digestion. Lemon balm in particular has some human data on mild anxiety.
Passionflower. Another traditional relaxant, often paired with valerian.
Ashwagandha. An adaptogen, meaning it’s associated with helping the body manage stress load rather than sedating. Most of the research is human or rodent. Increasingly common in premium formulations.
None of these will knock a dog out, and if a product does knock your dog out, look very carefully at what’s actually in it.
What about hemp and CBD?
Worth being clear, because the marketing muddles it deliberately.
Hemp seed oil and CBD are not the same thing. Hemp seed oil is a food ingredient – a source of omega fatty acids, useful for skin and coat, with no calming action to speak of. Plenty of “hemp calming chews” contain only hemp seed oil, and the calming, if any, comes from the other ingredients.
CBD is a different matter and, in the UK, a legally complicated one. Cannabidiol intended to have an effect in animals is treated as a veterinary medicine here, which means a licensed product prescribed by a vet rather than something bought off a shelf. Products sold openly for pets sit in a grey area at best.
If a label leans heavily on hemp imagery, check whether you’re buying seed oil or an actual cannabinoid, and if it’s the latter, ask why it isn’t going through a vet.
Dose is everything
This is the part that separates the two halves of the market.
“Contains valerian root” tells you nothing at all. Valerian at 5mg per chew and valerian at 100mg per chew are different products with the same ingredients list, and only one of them has a chance of doing anything.
Work it out per serving, not per tub. A product might boast 3,000mg of active ingredients per 100g, which sounds impressive until you notice a chew weighs 3g and your dog gets one a day.
Then check the feeding guide against your dog’s weight. Most soft chews scale one chew per 10kg, so a 35kg labrador is getting three or four times what a 8kg terrier gets. A product that looks well-dosed for a small dog may be underpowered for a big one, and the tub empties three times faster.
Format matters more than people expect
Soft chews get eaten willingly because the dog reads them as a treat. That sounds trivial and it’s the single biggest predictor of whether a supplement actually gets into the dog. They’re usually the most palatable option and the easiest to give consistently.
Tablets are cheaper per dose and frequently end up under the sofa. Fine for a dog who’ll take anything wrapped in cheese, useless for a fussy one.
Powders are good for dogs who eat everything in the bowl and hopeless for those who eat around them. They also make it hard to give an accurate dose unless you’re weighing scoops.
Liquids and pastes are useful for precise dosing and for dogs who won’t take solids, but they’re messy and shorter-lived once opened.
There’s no best format. There’s only the one your particular dog will reliably take every day for a month, which is the timescale most of these need.
Reading the rest of the label
The analytical constituents panel – protein, fat, fibre, ash, moisture – is required by pet food regulations and tells you about the base of the chew rather than the actives. Very high fat is worth noticing if your dog is prone to pancreatitis or watching their weight.
The composition list is everything in descending order. If the first six items are glycerin, flours, starches and yeast, that’s the biscuit; the useful bits come later. That’s normal and not a problem in itself, but it does mean the actives are a small fraction of what you’re feeding.
Preservatives. Rosemary extract with tocopherols is a natural antioxidant system and a good sign. Long chemical preservative names aren’t necessarily harmful but tell you something about the price point.
Suitability. Look for a minimum age, and check for anything relevant if your dog is pregnant, nursing or on medication.
How to tell whether it’s actually working
Harder than it sounds, and most owners get this wrong in one of two directions.
The first mistake is judging it on a single day. Anxiety fluctuates for reasons that have nothing to do with what you’re feeding – the weather, whether the postman came, how much sleep the dog got, whether next door are having work done. One good evening proves nothing and one bad one doesn’t either.
The second is changing several things at once. If you start a supplement, buy a plug-in diffuser and begin a training programme in the same week, you’ll never know which of them did anything. Change one thing, give it a fair run, then change the next.
The practical approach is dull and it works. Before you start, write down two or three specific, countable things: how long he takes to settle after you get home, how many times he wakes in the night, whether he’ll take food during a thunderstorm. Then note them once a day for a month.
Improvement in anxiety is slow enough that memory is genuinely unreliable – owners routinely forget how bad week one was. A fortnight of scribbled notes will tell you what your recollection won’t, and it also stops you persevering for six months with something that’s doing nothing.
Give it four weeks minimum for daily support. If there’s no measurable change by then, at a proper dose, it’s probably not the product for your dog.
Combining supplements
Perfectly normal to want joint support and calming support at once, and generally fine to feed both.
Two things to watch. Check for overlapping ingredients so you’re not doubling up on something without realising, which is most likely with vitamins and minerals. And count the calories, because two or three chews a day from two different tubs adds up in a small dog.
If your dog is on prescription medication for anything, ask your vet before adding supplements. It’s rarely a problem and it’s a thirty-second conversation.
Red flags
A calming product making medical claims – “treats anxiety”, “cures separation anxiety”, “stops barking” – is either badly regulated or badly informed. Supplements support; they don’t treat. In the UK, making a medicinal claim about a supplement is a regulatory problem, not just marketing puff.
Before-and-after photographs. Testimonials that read like fiction. A formula with fourteen actives, all of them at token levels, because a long list impresses more than a short effective one.
And no batch number or best-before date, which occasionally happens with the very cheapest imports and tells you nobody’s tracking quality.
What to ask before you buy
Three questions, and any decent manufacturer will answer all three without hesitating.
How many milligrams of each active are in one chew? Where is it manufactured, and to what standard? And is there a nutritionist or vet involved in the formulation?
A company that answers openly is a company that has nothing to hide about the dose. One that deflects to “our proprietary formula” has told you what you needed to know.