How to stop my dog from marking in the house

Indoor marking — small amounts of urine on vertical surfaces, furniture, or new objects — is usually territorial or hormonal, not a housetraining failure. Clean every spot with an enzymatic cleaner, block access to common marking targets, ask your vet about spay or neuter, and supervise closely indoors so you can interrupt and redirect outside.

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Step by step

Clean every marked spot with an enzymatic cleaner, not just soap or bleach — dogs remark spots where they can still smell old urine, even faintly.
Rule out medical causes with a vet visit; a checkup can catch UTIs or other issues that mimic marking, and is the right place to discuss whether spay or neuter would help.
Supervise indoors or use baby gates and a leash so you can catch the behavior early — a quick, cheerful interrupt and trip outside works better than a delayed correction.
Remove or block common triggers — new furniture, guests' bags, other pets' bedding, anything with an unfamiliar scent — until marking has stopped for several weeks.
Create plenty of reinforced chances to mark appropriately outside, and reward calm, marking-free time indoors so your dog learns indoors is a no-marking zone.
If marking continues despite consistent management, or shows up alongside stress (a new pet, a baby, a move), work with a certified force-free trainer or behaviorist to address the underlying trigger.

Frequently asked questions

Is marking the same as not being potty trained?

No. Marking is usually small amounts left on vertical or novel objects by a dog that's otherwise reliably housetrained, driven by territorial or hormonal instinct rather than a full bladder.

Does neutering stop marking completely?

It often reduces marking, especially when done before the habit is well established, but it isn't a guaranteed fix on its own — pair it with consistent cleaning and management.

My spayed female dog marks too — why?

Marking isn't exclusive to intact males. Spayed females and neutered males can mark due to stress, new smells, or multi-pet household dynamics, so the same cleaning and management steps apply.