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Good Paws Guide / Articles / Cat spraying indoors: what to do

Guide · updated 1 November 2026 · by the Good Paws Guide team

Cat spraying indoors: what to do

Cat Spraying Indoors: Why It Happens and What to Do
Short answer: Spraying is usually territorial or stress-related marking. Have your vet check for urinary problems first, neuter if not done, then reduce triggers (outside cats, conflict between cats, changes at home), give each cat its own resources, and clean marked spots with an enzymatic cleaner so the smell doesn’t draw them back.

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A guide for owners dealing with spraying, according to the vendor. Use it after a vet check.

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Spraying or peeing?

Spraying is a small amount on a vertical surface with the tail raised; inappropriate peeing is a puddle on a flat surface. For the latter, see peeing outside the box.

Step-by-step plan

  1. Vet check: urinary disease can mimic spraying.
  2. Neutering greatly reduces spraying in most cats.
  3. Block views of outside cats at windows; secure the cat flap.
  4. Separate resources: food, water, litter, beds, scratching posts in different places.
  5. Clean with enzymatic cleaner, not ammonia.
  6. Keep a diary of when and where it happens.
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Cat Spray Stop

A guide for owners dealing with spraying, according to the vendor. Use it after a vet check.

See Cat Spray Stop →  Read our notes

Multi-cat homes

Tension between cats is a major cause. Provide high resting places and escape routes. International Cat Care has detailed guidance at icatcare.org.

When to get help

If spraying continues after these steps, ask your vet about referral to a qualified feline behaviourist.

When to get professional help: sudden behaviour changes, aggression, or toileting problems can have medical causes, so see your vet first. For behaviour help, look for a qualified practitioner on the Animal Behaviour and Training Council register (abtc.org.uk). If you think a pet is in an emergency, call your vet straight away.

Common questions

Why has my cat suddenly started spraying?

Often a new stressor: a new cat outside, new pet, house move or building work. Rule out medical causes first.

Do female cats spray?

Yes, though less often than unneutered males.

Does punishment stop spraying?

No. It increases stress and usually makes it worse.

What we’d look at next

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Cat Spray Stop

A guide for owners dealing with spraying, according to the vendor. Use it after a vet check.

See Cat Spray Stop →  Read our notes

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Secrets to Dog Training

If you also have a dog whose behaviour is part of the household stress.

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