By Dr Duncan Houston
Your cat rolls over a catnip toy, rubs their face against it and suddenly wants to play. Another cat in the same home ignores it completely. Both reactions can be normal.
The useful question is whether your cat enjoys the experience and returns to their usual behaviour afterwards. Catnip is optional enrichment, and an uncomfortable reaction is a reason to stop.
Quick Answer
Catnip is a plant whose scent can briefly change some cats' behaviour, encouraging rubbing, rolling or play. Responses vary, and it should not be relied on to treat anxiety or illness. Offer a small amount under supervision, avoid concentrated oils and stop if your cat becomes distressed or unwell.
What is catnip, and how does it work?
Catnip, Nepeta cataria, belongs to the mint family. Its scent contains nepetalactone, which helps trigger the characteristic response. Cats do not need to eat it to react: smelling the plant material is enough. A study of catnip and other scent-based enrichment describes behaviours including cheek rubbing, rolling, licking and kicking at the material.
Some cats become lively; others appear relaxed. This short response does not demonstrate that an anxious cat's underlying problem has improved. Veterinary behaviour guidance from VCA recommends avoiding catnip if it makes a cat agitated.
Why do some cats ignore it?
Sensitivity has an inherited component, and many healthy cats do not respond. Young kittens often show little interest, with responses commonly emerging between about three and six months. Humane World for Animals explains this variation and the typical brief response, which often lasts around ten minutes.
A cat may then ignore the scent for a while. Do not keep adding more to restart the reaction. A lifelong lack of interest alone needs no treatment; a new loss of interest in all play, food or interaction warrants a veterinary discussion.
Is the reaction enjoyable or concerning?
| What you notice | What it means for your decision | What to do |
|---|---|---|
| Brief rubbing or play, normal breathing, then usual behaviour | Consistent with a typical response | Supervise and let your cat finish or leave. |
| Growling, tense posture, swatting at people or other cats | The activity is causing unwanted arousal or conflict | Give space, end access when safe and avoid catnip in future. |
| Vomiting, diarrhoea or behaviour that remains abnormal | Do not dismiss this as enjoyable play | Remove access and contact your vet for advice; seek prompt care if signs repeat or your cat seems unwell. |
| Collapse, difficulty breathing or inability to stand normally | An emergency, whatever the apparent trigger | Contact an emergency vet and arrange immediate assessment. |
Can catnip make a cat sick?
Calling catnip completely harmless is misleading. ASPCA Poison Control lists vomiting and diarrhoea as possible effects. Large mouthfuls of plant material are unnecessary, and repeated stomach upset is a reason to stop offering it.
Concentrated catnip oil, homemade extracts and essential-oil blends are different from a little dried herb. Do not put them on your cat, add them to food or use them to scent toys. The ASPCA explains that concentrated essential oils can cause illness through skin contact or ingestion.
When do you need urgent help?
If your cat has swallowed an oil or concentrate, or it has spilled on their coat, call your vet or an animal poison service immediately, even before signs appear. Keep the packaging so the ingredients can be checked. Breathing difficulty, collapse or marked unsteadiness require emergency veterinary care.
How to offer catnip safely
- Choose a calm setting. Start when your cat is already comfortable, with an easy route away. In a multi-cat home, try it separately first.
- Start small. Offer one intact catnip toy or a light sprinkle of plain dried catnip on a scratching surface. There is no need to make it part of a meal.
- Watch the whole session. Keep hands away from excited play. Remove damaged toys that expose filling, string or pieces your cat could swallow.
- Finish when interest fades. Put loose catnip away securely. Use occasional sessions, rather than repeatedly topping it up.
- Record an unwanted reaction. Note the form, amount, time and signs. A short video can help your vet assess behaviour that continues after the session.
Common mistakes to avoid
- Trying to force a response by holding catnip against the cat's face.
- Using it for the first time immediately before travel or another stressful event.
- Assuming vomiting, prolonged withdrawal or poor coordination is part of the fun.
- Continuing after catnip triggers fighting or defensive behaviour.
Build enrichment around your cat's preferences
Catnip should be one optional activity among comfortable resting places, scratching opportunities and interactive play. Rotate activities and adjust movement to your cat's mobility. Predictable routines and freedom to disengage matter more than producing an impressive reaction.
If catnip is uninteresting, another scent may appeal. In the 100-cat enrichment study, some non-responders reacted to silver vine. This does not prove that it treats anxiety or that every preparation is suitable. Avoid substituting unidentified garden plants or concentrated extracts; ordinary play is also a valid choice.
Frequently Asked Questions
How long does catnip last?
The noticeable response often lasts around ten minutes, though individuals vary. Do not use that estimate to explain away ongoing abnormal behaviour.
Can kittens have catnip?
Young kittens often ignore it. They do not need it for development; choose age-appropriate supervised play and avoid loose parts they could swallow.
Can cats eat catnip?
A little incidental nibbling may occur, but eating it is not necessary. Avoid large quantities and stop if stomach upset develops.
Will catnip calm an anxious cat?
Not reliably. Some cats become more excited or defensive. Persistent fear, hiding or conflict needs assessment of the cat's health and environment.
Let your cat's response guide you
Continue only when the experience appears comfortable and your cat returns to normal afterwards. Ignoring catnip is fine; distress or illness deserves attention.
For more practical guidance on understanding your cat's behaviour and wellbeing, explore ASK A VET™.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
Every ASK A VET article is written and reviewed by qualified veterinarians.
