Cat Calming Pheromone Collar
The first thing I reach for with an anxious cat, before we ever discuss medication.
In stock - dispatched from the US
30-day guarantee - a calmer cat or we refund you 100%
- 30 Days Guarantee
- Free Shipping Over $40
- Drug-free formula
Nubello helps with
Destructive scratching
Spraying indoors
Hiding and fear
Loved by 3K+ Happy Customers
I bought the collar before moving because I wanted to help my thirteen-year-old cat handle all the packing and changes. He adjusted to the new house far more easily than I expected.
My five-year-old cat is very intelligent but has always struggled with anxiety. He meows less now, bullies the other cats less, and has stopped having so many accidents outside the litter box.
Our nine-year-old and our one-year-old were starting to fight more often, so I bought these collars without expecting much. Our older cat became noticeably kinder to the younger one, and friendlier with people too.
Open. Fasten. Relax.
Three steps, about a minute, and then you can forget it is there.
Open the pouch
The collar stays sealed until you need it. Body heat is what activates it, so nothing starts until it is on your cat.
Fasten it and trim
Fit it around the neck with room for two fingers underneath, snug enough to touch the skin. Cut off the excess strap and throw it away.
Let it work
It releases steadily for up to 30 days, through naps, play and the moments that set your cat off. Take it off only for baths.
Three houses, three problems
She stopped bolting when the door opened
A nervous rescue and a flat full of visitors.
Nine hours alone, nothing shredded
What the camera recorded before and after the switch.
First fireworks she did not hide from
A cat that used to disappear for two days.
vs. a plug-in diffuser

Most problem behaviour is, first, a stress problem.
I see anxious cats every week - the hiding, the scratching, the spraying indoors. Pheromone support is where I start, because it lowers the baseline enough that routine and enrichment finally have something to work with. It is not a sedative and it is not a cure, but for most households it is the cheapest thing worth trying first.
Dr. Lucy Scott
Has used Nubello in practice
Licence No. 009646
Try it risk-free
Give it a month. If nothing changes, we refund you.
One collar is one month, which is exactly how long it takes to know. Use it for the full 30 days. If your house is no calmer than it was, email us and we will refund the order - you do not have to ship the collar back.
Frequently asked
The basics
It is a soft, drug-free collar that gives off a copy of the scent signal cats already use to mark places they feel safe. Your cat reads it as “this is my territory, nothing bad happens here.” There is no medication, no sedative and nothing your cat swallows.
When your cat rubs her cheeks on the sofa corner, the door frame or your leg, she is leaving a scent marker. Cats only do that in places they have decided are safe. Our collar releases a lab-made version of that same facial marker, so your cat gets that “safe here” message everywhere she goes instead of only where she has rubbed.
No. It is a scent signal, not a substance that enters your cat's bloodstream. It does not knock her out, slow her down or dull her personality - owners consistently describe a cat who is still playful, just less on edge.
Your cat's own body heat. The collar has to sit against the skin at the back of the neck to release properly, which is why fit matters more than anything else on this page.
It will not work that way. Hanging in a room or lying in a carrier, the collar never warms up enough to release. If you want coverage for a room rather than a cat, a diffuser is the right tool - the collar is for the cat who carries her stress with her.
Most people smell nothing at all. A few notice a faint plastic smell in the first day or two out of the pouch, which fades. There is no perfume, no lavender and no “calming” scent added for humans - if you can smell a collar across the room, it is scented for you, not for your cat.
A diffuser treats one room. If your house is big, open-plan, or has more than one floor, you are buying three or four of them and still leaving gaps - and the trouble spots are usually the hallway, the stairs and the litter box, not the living room. The collar travels with your cat, so the signal is there in the carrier, at the vet, under the bed and at 3am. Plenty of owners run both; the collar is what covers everywhere the diffuser cannot reach.
Go to your vet first - a urinary infection or crystals can look exactly like a behaviour problem, and no collar fixes that. Once your vet has ruled out a medical cause, stress marking is the single most common reason owners buy this collar, and it is the change they report most often. Give it the full first collar before you judge it.
Start with the bully. Owners who collar the aggressor usually see the household settle faster than those who collar the cat being picked on. If it is not obvious who is starting it, collar both for the first month and watch.
That is the classic case. A new cat rewrites the territory your older cat had already settled, and hissing, hiding and marking are how she says so. Put the collar on a few days before the introduction if you can, and keep it on through the first month.
Night-time howling and zoomies are often an anxious cat, not a bored one, and it is one of the changes owners notice earliest - sometimes the first or second night. If your cat is a senior and the yowling is new, mention it to your vet as well, since it can have other causes.
It will not turn a shy cat into a social one, and you would not want it to. What owners describe is a cat who stops bolting - she stays in the room, watches from the arm of the sofa, and comes out sooner after guests leave.
About a week before, so the collar is already familiar when the boxes come out, and keep it on through the first few weeks in the new place while she claims it. For vet visits and car trips, on the day works - but a week ahead works better.
Ask your vet, and follow what they say. Because the collar is a scent signal rather than something absorbed into the body, vets often have no issue with it alongside a prescription - but your vet knows your cat and we do not, so that call is theirs.
No, and anyone who says otherwise is selling. Some cats respond in hours, some take two or three weeks, and a small number never respond at all. It also will not out-argue a real cause: a dirty litter box, a resource the cats are fighting over, or pain. That is exactly why we back it with a guarantee instead of a promise.
Two fingers, flat, between the collar and your cat's neck. Any looser and it never touches skin, so it never activates - loose is the number one reason a collar “does not work.” Any tighter and it is uncomfortable and cannot release if she gets caught.
It is one adjustable size that fits from a small kitten up to a large adult, and you trim the excess after fitting. With a growing kitten, check the fit weekly - they outgrow a snug collar faster than you expect.
Yes. Fit it first, then trim the tail so there is nothing dangling for her to chew or catch. Cutting does not weaken it or reduce how much it releases.
Almost always fit. Re-check the two-finger rule, make sure her fur is not caught in the buckle, and press the fastening fully closed until it clicks. Please do not zip-tie or tape it shut. The release is what stops a collar becoming a noose if she snags it on a fence or a vent - sealing it removes the one feature protecting her.
Yes. Wear both, with the calming collar sitting against the skin underneath and the ID collar over the top. Fit each one separately with the two-finger rule so neither ends up tight.
Put it on right before a meal or a play session so the first minutes are associated with something good, and ignore the dramatic flopping - most cats forget it is there within a day. If she is genuinely distressed, take it off, leave it near her bed overnight so it smells familiar, and try again tomorrow.
Yes, for the best result. It releases continuously while she wears it, so taking it off at night or only putting it on for stressful days gives you a fraction of the effect.
It is suitable for kittens from 12 weeks and for senior cats. With a kitten, keep the trimmed end short so there is nothing for her to chew. If your kitten is very young, underweight or unwell, ask your vet first.
The fastening is designed to pull apart under pressure, so a snagged collar comes off rather than tightening. That is also why it occasionally comes off on its own - the two go together, and we would rather find a collar under the sofa than the alternative.
No essential oils - no lavender, no tea tree, no chamomile. Cats process oils very differently to us and many vets advise keeping them off cats entirely, which is why a lot of “natural” calming collars are worth reading the label on. Ours works on pheromones alone.
Cat pheromones are species-specific, so people cannot read them at all and are completely unaffected. Other cats nearby may pick up a little of the signal, but only right next to the wearer, so each cat who needs it should have her own.
There is nothing toxic in it, but it is plastic, and swallowed plastic can cause a blockage in any cat. If yours is a determined chewer, trim the tail short, check the collar daily, and take it off if she is working at it. If you think she has swallowed a piece, call your vet.
A splash is fine. For a proper soaking or a bath, take it off, pat it dry and put it straight back on - it carries on working normally, and a wet collar against the skin is uncomfortable for her.
It is uncommon, but any collar worn constantly can rub, especially if it is on the tight side. Part the fur underneath once a week and look at the skin. If you see redness or thinning fur, loosen it a notch, and stop using it if that does not settle within a few days.
Some owners notice a calmer cat the same evening. For most it builds over the first week, and for anxiety that has been building for years, give it the full first collar. If nothing at all has changed after 30 days, that is what the guarantee is for.
Up to 30 days from the moment you take it out of the sealed pouch. Your pack of 3 covers 90 days. Leave the spare sealed until you need it - an opened collar starts releasing whether or not it is on a cat.
Two usual reasons. Either the collar has loosened over the month and is no longer touching skin - re-check the two-finger fit first, it fixes it more often than not - or your cat is a heavier responder and genuinely runs a collar down faster. Some owners switch at three weeks for that reason.
Depends on why you started. If it was a one-off upheaval - a move, a new cat, building work - many owners use two or three collars while things settle and then stop. If your cat is anxious by nature, most keep one on year-round and just replace it monthly.
One per cat, worn at the same time. The signal does not travel far enough for one collar to cover a household, so in a multi-cat home the collars are doing separate jobs on separate cats.
Orders leave within 1 business day and arrive in 7 business days across the US. You will get tracking by email as soon as it ships.
Then you should not be out of pocket. Use it properly for 30 days - correct fit, worn continuously - and if your cat is no calmer, email us and we will refund you. You do not need to send the collar back; give it to a friend with a nervous cat.
Still not sure? Write to us - a person answers.
Customer Reviews
Worth every penny
These collars have honestly saved my sanity. We have two cats who had been having problems for over a year - one was spraying and the other was leaving puddles around the house. We tried medication, which helped, but it was expensive and difficult to give every day. We also tried pheromone diffusers with some improvement, but once we added these collars, the difference was huge. Accidents outside the litter box are now very rare.
A miracle for our cat
Our older cat became extremely stressed after we started fostering other cats. She began peeing outside the litter box and seemed completely withdrawn. The vet could not find anything physically wrong and believed it was behavioural. I did not want to fill the house with plug-in diffusers, so I decided to try this collar. Within a day she was already beginning to relax. A few weeks later she was basically back to her old personality.
Wow, what a difference
My cat used to scratch just about everything in the house. Nothing I tried seemed to stop her. I was sceptical about using a pheromone collar because I did not want it to completely change her personality. I am so happy I gave it a chance. The collar has no noticeable odour, and within the first day she was already leaving her usual scratching spots alone. I was so impressed that I ordered more for my other cats.
Stopped the aggression
Our older cat constantly stalked and attacked our younger cat. It got so bad that the younger one became afraid to move around the house comfortably. I put these collars on both of them, and the change was incredible. Within the same day they were already much calmer around each other. By that evening they were even lying together.
Much less anxiety
We have several cats, and one of them has always been especially anxious. Whenever guests stayed over, he would get stressed and sometimes urinate outside the litter box. Since using this collar he is much calmer overall. The marking stopped, he is less aggressive with the other cats, and he does not spend the night constantly meowing anymore. We can definitely notice when it is getting close to time for a fresh collar.
This collar really works for us
Our cat has always been extremely anxious and started overgrooming herself until she had several bald spots. We tried different things without much improvement, so I ordered this collar as a last attempt. I could see her becoming more relaxed shortly after putting it on. Since then her excessive grooming has improved tremendously.
Night-and-day difference
After moving from an apartment into a much larger house, our eight-year-old cat became extremely vocal day and night. We realised the move was probably causing him anxiety, so we decided to try this collar. Within hours he seemed noticeably more relaxed. The constant meowing decreased dramatically and he looked much more comfortable in his new environment.
Cat magic
Our rescue cat had struggled with anxiety and spraying since he was young. We tried different things over the years, but the behaviour eventually returned. Since putting this collar on him he has not sprayed at all. Even better, he seems much more relaxed, affectionate and comfortable around people. It feels like we are finally seeing his real personality come through.
Great for stressed cats
We have two older cats who really did not get along. Before using these collars there was growling, fighting and plenty of nighttime drama. Now they mostly leave each other alone and can peacefully share the same space. They may never become best friends, but the atmosphere in the house is so much calmer.
More than five stars
Our cat had been staying awake at night howling so loudly that I was worried about disturbing the neighbours. I tried one of these collars and noticed a difference almost immediately. By the second day she was much calmer, sleeping peacefully and no longer racing around crying throughout the night. Our home feels quiet and relaxed again.
A completely different cat
I bought this for an older cat who was having a hard time adjusting to a new kitten. She was angry with everyone and had always been known for being difficult with people. Since wearing this collar she has become so much calmer and more approachable. She will actually let people pet her now and seems much more tolerant of the other animals in the house.
A game changer
We introduced a kitten into our home, and one of our older cats simply would not accept him. Months went by with constant hissing and growling despite trying sprays and plug-in pheromones. After putting this collar on her the difference showed up within a day. The hissing nearly disappeared and she became much more tolerant of the kitten. We definitely noticed when the collar reached the end of its life because the old behaviour slowly returned. A fresh collar calmed things right back down.
Night and day for our cat
The first night we used this collar the difference was so noticeable that my husband became emotional. Our cat has significant separation anxiety and normally needs to be right beside us constantly. With the collar he is much more relaxed and independent, and the constant yowling has decreased substantially. The breakaway design also gives us peace of mind.
From bitey to snuggly
Our cat became extremely irritable during the summer and started stalking and biting us even though we were playing with her regularly and giving her space. She seemed genuinely stressed. I decided to try this collar while waiting for her vet appointment, and the change was incredible. She became relaxed, affectionate, playful and much less reactive.
Total game changer
I honestly do not know how this collar works so well, but my cat is incredibly relaxed when he wears it. He does not jump at every little sound anymore and has become much more cuddly and affectionate. If you have a cat who seems constantly stressed or on edge, this is definitely worth trying.
Helped my extremely stressed cat
Our eight-year-old cat had been pulling out the fur on her back for years. We had taken her to several vet appointments and tried different approaches without finding much relief. Eventually I suspected stress might be the cause and decided to try a calming collar. I am so glad I did. She became noticeably more relaxed and stopped obsessively pulling at her fur.
I cannot believe the difference
We recently moved and almost everything about our cat's environment changed. He lost his balcony, had a different litter box, and went from living in the countryside to the middle of the city. I did not expect the collar to make much difference, but I was wrong. He became calmer, adjusted to his litter box, stopped constantly meowing, and overall just seemed much more relaxed.
Perfect for our international move
We travelled internationally with six cats and these collars were incredibly helpful. We put them on before putting the cats into their carriers, and they stayed calm throughout the journey. Even after arriving at the new house they remained relaxed and affectionate. There was no marking and hardly any tension between them. We were so impressed that we immediately ordered more.
The collar really helps
Our vet recommended a supplement for our cat because he was dealing with stress-related behaviour. I decided to combine a smaller amount of the supplement with this collar, and the results have been excellent. His demeanour changed noticeably, and I could even tell when the collar was reaching the end of the month because his old behaviour started returning. A fresh collar made the difference again.
Much better for our home than plug-ins
We have several cats of different ages, and sometimes the younger ones really get on the older cats' nerves. We tried plug-in pheromones, but because our home is large and open the effect was limited to the areas near the diffusers. These collars worked much better for our situation because the calming support goes wherever the cats go. The amount of fighting has dropped dramatically.
Scent-free and effective
I have tried other calming collars that had such a strong lavender scent that neither my cat nor I enjoyed them. This one is genuinely scent-free, which immediately made me happy. I wondered whether it would still work without the strong smell, and it absolutely did for us. My cat had started spraying again, and after putting this collar on, the behaviour stopped.
It works
I had tried plug-ins and several other calming products because one of my cats was constantly aggressive toward our newer kitten. Nothing seemed to make enough of a difference. Then I tried this collar, and the change felt almost immediate. He became the sweet cat we remembered, and now the two cats play together and even sleep curled up next to each other.
Amazing for my nervous cat
I have a very skittish six-year-old cat and a playful kitten who was making her even more nervous. Less than a week after putting the calming collars on them we noticed a major reduction in fighting. The biggest surprise came when we had friends over. Normally our older cat disappears and hides, but this time she relaxed right in the middle of the room with everyone.
Changed my cats completely
I was sceptical at first because two of my cats had basically decided they were enemies. I had tried slow introductions, separate areas, calming products, cat trees, shelves, and separate food and litter areas. They would still immediately scream and attack each other whenever they met. The day I put these collars on them, things changed. They spent the entire afternoon around each other with almost no fighting.
Perfect for our rescue cat
We rescued a stray cat who had a hard time feeling comfortable around visitors. She could become very aggressive whenever friends or family came over. After trying different behavioural approaches and products, we finally found something that made a noticeable difference. Since wearing this collar she is far calmer around guests and has even started relaxing nearby while people visit.
Easy to use and no strong smell
One of our cats has to take medication that sometimes makes her restless and irritable. These calming collars have been a huge help, especially at night. I have tried several brands, but I particularly like these because they are simple to adjust, do not have an overpowering smell, and have a breakaway design that actually works.
Amazing results for our cat
Our neutered male cat suddenly started marking around the house after stray cats began appearing outside. He seemed incredibly stressed and the spraying had become a serious problem. Since putting this collar on him he has not sprayed again and seems much more like his normal self. We now keep extras on hand.
Two much calmer cats
We have two cats with very different personalities. One likes to bother the other, and the other becomes extremely stressed during car rides. When we moved I wanted something that might help them stay calm. The trip went better than I could have imagined. There was no howling, sickness or panic in the carrier, and both cats were noticeably more relaxed with each other afterwards.
Incredibly effective
I was sceptical because we had already tried several things to help our cat settle down at night. Nothing seemed to work until we tried this collar. She became so much calmer, and I can finally sleep through most nights without her bouncing around the room or getting into everything. Her sweeter, more affectionate personality really comes through when she is relaxed.
Works quickly for our anxious cat
Our cat has always been extremely anxious and can jump at the smallest noise. When she is stressed she even becomes nervous about going downstairs to use her litter box. This collar has made a big difference for her and seems to help her relax very quickly. I also appreciate the breakaway design because safety is extremely important to me.

vs. a plug-in diffuser
