A house-trained senior dog having accidents is usually a medical change, not bad behavior. Learn how to tell leaking from peeing, the most common causes in older dogs, when it is urgent, and a home checklist.
If your house-trained senior dog has suddenly started peeing in the house, it is usually a medical or age-related change, not bad behavior. The most common causes are a urinary tract infection, kidney disease, diabetes or Cushing's disease (which make dogs drink and pee more), true incontinence (leaking without knowing), arthritis pain that makes going outside hard, and canine cognitive dysfunction. Book a vet visit and bring a fresh urine sample if you can. Do not punish accidents; stress makes them worse.
Leaking or peeing? Tell them apart
Leaking (incontinence): wet spots where your dog sleeps or lies, dribbling while walking, and your dog does not seem to notice. VCA Animal Hospitals notes it is most common in middle-aged to senior, medium to large-breed female dogs.
Peeing on purpose: your dog squats or lifts a leg in the house, often near the door, and may seem to need to go more often or more urgently.
Both need a vet check, but the answer helps your vet narrow the cause.
Common causes in senior dogs
1. Urinary tract infection or bladder stones: small, frequent pees, straining, blood or a strong smell.
2. Drinking more: kidney disease, diabetes and Cushing's disease all increase thirst and urine. Check intake with our [Senior Dog Water Calculator](/water-calculator).
3. Incontinence: weak bladder sphincter muscles, often treatable with medicine.
4. Pain: the American Kennel Club notes arthritis can make squatting or walking outside uncomfortable, so dogs hold it until they cannot.
5. Cognitive dysfunction: dogs may forget house training, go right after coming inside, or have accidents at night.
6. Vision or hearing loss, a new medicine (such as steroids or diuretics), or changes at home.
Call your vet today if
Your dog is straining with little or no urine (this can be a blockage and is an emergency), there is blood in the urine, your dog is drinking much more than usual, not eating, vomiting, or seems painful.
What to do at home (checklist)
1. Write down when and where accidents happen, and whether it looks like leaking or peeing.
2. Measure water intake for 24 hours.
3. Add more potty breaks: first thing in the morning, after meals, after naps and right before bed.
4. Make the trip easy: a ramp for steps, a night light, and a clear path to the door.
5. Clean every spot with an enzyme cleaner; regular cleaners leave a scent that invites repeat accidents.
6. Protect beds and floors with washable pads or a belly band while you wait for answers.
7. Never punish or rub your dog's nose in it.
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Check skin under wraps and diapers daily. Both are popular picks on Amazon.
What your vet may check
A urinalysis and urine culture, blood work for kidneys, liver and blood sugar, and sometimes X-rays or ultrasound to look for stones. Many causes, including infections and incontinence, respond well to treatment.
Related guides
[Managing senior dog incontinence with pads and diapers](/blog/managing-senior-dog-incontinence-pads-diapers)
[Urinary tract infections in senior dogs](/blog/urinary-tract-infections-senior-dogs)
[Senior dog drinking a lot of water](/blog/senior-dog-drinking-lot-of-water)
Frequently asked questions
Why has my old dog started peeing in the house all of a sudden? A new infection, a change in thirst, pain or cognitive decline are the most common reasons. A vet visit with a urine test is the fastest way to find out.
Is my old dog peeing in the house a sign of dying? Not by itself. Many causes are treatable. Talk with your vet about your dog's overall health and quality of life.
Should I limit water to stop accidents? No, not without your vet's advice. Dogs with kidney disease or diabetes can dehydrate quickly.
Can dog diapers help? Yes, as a short-term way to protect your home while you work with your vet, but check the skin often to prevent rashes.
Sources: [AKC: Why Is My House-Trained Senior Dog Suddenly Having Accidents?](https://www.akc.org/expert-advice/health/senior-dog-house-training/); [AKC: Incontinence in Dogs](https://www.akc.org/expert-advice/health/incontinence-in-dogs/); [VCA: Urinary Incontinence in Dogs](https://vcahospitals.com/know-your-pet/urethral-incontinence-in-dogs).
This guide is educational and does not replace your veterinarian. SILVERPAW earns from qualifying Amazon purchases at no extra cost to you.
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