Why Does My Dog Have Accidents and Scent Mark Indoors?

In newly rehomed dogs, accidents and scent marking are rarely about a lack of training. They're usually driven by stress, anxiety and a need to feel secure in an unfamiliar environment. Both behaviours are incredibly common, particularly in the first few weeks. Your dog is navigating a world full of unfamiliar smells, sounds and routines, and these behaviours are their way of coping with that uncertainty.

Accidents are when your dog urinates or defecates indoors, typically in larger amounts and often on the floor. Scent marking is usually small amounts of urine deposited on vertical surfaces such as furniture legs, door frames or walls.

Why do dogs do this?

Anxiety and insecurity: In a new home, your dog doesn't know the rules yet. Everything is unfamiliar, and they haven't learnt that being in this environment is safe. Scent marking is a way for dogs to make the space smell like theirs, which provides comfort and security.

Unfamiliar smells: Your home is full of scents from previous pets, visitors or even previous occupants. These new smells can trigger marking behaviour as your dog tries to overlay their own scent.

Lack of established routine: Your dog hasn't yet learnt when and where they're expected to toilet. They may not understand the connection between going outside and toileting, especially if their previous environment had different expectations.

Medical issues: Urinary tract infections, digestive problems or other health conditions can cause genuine accidents. If your dog is toileting indoors frequently, a vet check should always be your first step.

Stress responses: Some dogs will have stress-related accidents when they're overwhelmed. If your dog is experiencing separation anxiety or general environmental stress, accidents can be a symptom.

How to help your dog

Step 1: Rule out medical issues

Before addressing this as a behavioural problem, book a vet appointment to rule out urinary tract infections, digestive issues or other medical conditions. This is particularly important if the accidents are frequent or your dog seems uncomfortable.

Step 2: Establish a strict toileting schedule

Consistency is key. Your dog needs to learn the new routine and that only happens through repetition. Take your dog outside at predictable times:

• Immediately upon waking up

• Immediately after eating or drinking

• After every play session or exciting event

• Before being crated and immediately after being let out

• Last thing at night

Step 3: Supervise constantly

Use a house lead to keep your dog tethered to you when indoors or confine them to a small area where you can watch them closely. This prevents mistakes and allows you to catch the early signs that they need to go out (sniffing, circling or moving toward the door).

Step 4: Reward outdoor toileting generously

When your dog toilets outside, make it the best thing they do all day. Use high-value treats and give enthusiastic praise. This creates a positive association with going outside.

Step 5: Clean accidents thoroughly

Standard household cleaners won't remove the scent for your dog's sensitive nose. Use an enzymatic cleaner specifically designed for pet accidents. If your dog can still smell the spot, they'll be drawn back to it.

Step 6: Manage access to marking areas

If your dog is repeatedly marking a specific piece of furniture or area, block access to that room when you can't supervise. You want to prevent the behaviour from becoming a habit.

Step 7: Interrupt gently, never punish

If you catch your dog in the act of marking or having an accident, use a soft "uh-oh" to interrupt, then calmly guide them outside. Never shout, punish or rub their nose in it. This will only increase their anxiety and make the problem worse.

Step 8: Stay calm around departures and arrivals

Be very calm for 15 minutes before you leave and 15 minutes after your return. Big emotional hellos and goodbyes can increase excitement or stress and trigger marking or accidents.

Indoor accidents and scent marking in newly rehomed dogs are almost always temporary issues driven by stress and unfamiliarity. With patience, a consistent routine and lots of positive reinforcement, your dog will learn the rules of their new home.

Remember: punishment doesn't work. What your dog needs is time, security and clear but gentle guidance. If the behaviour persists beyond a few weeks despite your best efforts, consult a qualified behaviourist who can assess your individual situation and provide tailored support.