My Older Dog Has Started Having Accidents. Is It Dementia?

Finding urine on the floor after years of reliable house training can be worrying. Perhaps your dog has stopped asking to go outside, started having accidents overnight, or urinated indoors shortly after a walk. You may wonder whether your dog is developing dementia. Cognitive decline is one possibility, but house soiling alone cannot establish that diagnosis. The useful starting point is to investigate what has changed in your dog’s health, behaviour, and ability to manage their usual routine.

A recent study examined house soiling, urine findings, and cognitive performance in 84 aging dogs. The dogs underwent repeated assessments, including urine testing, owner questionnaires, and cognitive tasks. Greater house soiling was associated with increasing age, less concentrated urine, and poorer performance on tasks involving inhibitory control and navigating around an obstacle. These findings suggest that both physical and cognitive changes deserve consideration when an older dog starts having accidents.

The research does not show that accidents prove dementia or that urinary disease can be dismissed. Because it was observational, it identified associations rather than causes. The dogs were also sufficiently healthy to participate in a longitudinal study, which limits how directly the findings apply to dogs with unstable illnesses. Its practical contribution is to broaden the investigation: a urine test provides important information, but it cannot explain every aspect of a dog’s elimination behaviour.

Start by describing the accident

“Having accidents” can describe several different events. Your dog might leave a wet patch while sleeping, walk towards the door but urinate before reaching it, or stop and empty their bladder in the middle of the room. These observations give your veterinarian different information. Urinary incontinence means passive, involuntary urine leakage and can involve disorders affecting urine storage or emptying. House soiling is therefore not automatically the same as urinary incontinence.

Before the appointment, describe what you actually see without trying to name the cause. Note whether your dog was awake or asleep, whether they adopted their usual urinating posture, and whether the accident involved urine, stool, or both. Record whether they asked to go outside and how recently they had an opportunity to eliminate. “A wet patch appeared beneath her while she slept” is more informative than “she has forgotten her training.” The first describes an event; the second assumes an explanation.

Consider the whole dog

Your veterinarian will need to assess more than the puddle’s location. Changes in drinking, appetite, weight, mobility, medication, and sleep may help guide the investigation. Urine testing can assess concentration and identify findings that warrant further investigation. Depending on the history and examination, your veterinarian may recommend blood testing, a urine culture, imaging, or other assessments. A reassuring initial result should guide the next step, rather than end the investigation while accidents continue.

Access to the usual toileting area also deserves attention. Watch the entire journey: getting up from bed, crossing the floor, reaching the door, negotiating steps, and adopting an elimination posture. Where does your dog hesitate? Have you started waiting longer for them to stand up or follow you? These details are worth reporting even if your dog still enjoys walks. An apparently familiar routine may now involve difficulties that were absent a year ago.

Another study examined owner reports concerning 804 senior dogs and found relationships between cognitive-assessment scores and indicators of other health problems, particularly musculoskeletal and neurological changes. Its findings highlight the importance of considering pain and sensory decline when interpreting behaviour in older dogs. They do not establish that pain causes dementia. They show why behaviour suggesting cognitive impairment needs to be assessed alongside physical health.

This means the investigation does not have to choose immediately between “a medical problem” and “a behavioural problem.” Several difficulties may be present together. Tell your veterinarian about every relevant change, even those that seem unrelated to toileting. A reluctance to use the back steps, more disturbed sleep, and accidents near the door may belong in the same history. Your observations help establish which problems need attention and whether one explanation adequately accounts for the pattern.

When cognitive decline becomes a concern

Canine cognitive dysfunction syndrome involves progressive changes across several areas of daily life. These can include orientation, social interaction, sleep, house soiling, learning and memory, activity, and anxiety. Assessment includes investigating alternative explanations and determining whether relevant changes persist after managing concurrent conditions. House soiling is one part of that assessment, rather than a stand-alone diagnostic test.

Think about your dog’s behaviour beyond elimination. Have familiar routes through the house become difficult? Has their interaction with you changed? Are nights increasingly unsettled? Describe when each change began and whether it is becoming more frequent. Avoid compressing everything into “getting old.” Equally, avoid interpreting every unusual event as dementia. A timeline of specific observations allows your veterinarian to assess the pattern more carefully than a general impression can.

Questionnaires can help organize that information, particularly when changes develop gradually. However, completing a questionnaire is not the same as receiving a diagnosis. Different questionnaires can classify the same dog differently, and you should interpret their results alongside clinical findings. Use a questionnaire recommended by your veterinarian and answer according to what you observe, rather than what you think a particular answer means.

Make the next appointment more useful

A simple diary can turn a frustrating, apparently unpredictable problem into a clearer account. Record the time of each accident, what happened immediately beforehand, the last outdoor opportunity, and any other changes that day. Include accident-free days as well. If appropriate, a short video of your dog getting up, approaching the door, or negotiating the route outside may help communicate a difficulty that is less obvious in the consulting room.

While the cause is being investigated, make toileting opportunities easier to offer and observe. You might accompany your dog outside rather than assume that opening the door is sufficient, allow time for elimination, and use the most accessible route. Ask your veterinarian which adjustments suit your dog. Treat these changes as support while gathering information, and report their effects. Fewer accidents after a routine adjustment are useful information, but do not independently establish why the problem began.

Agree on what to monitor after the initial assessment. That might include accidents per week, overnight leakage, successful outdoor elimination, or difficulty reaching the door. If treatment addresses one suspected contributor, ask when to review progress and what continued accidents would mean for the next stage of investigation. Follow-up matters because the first explanation may account for only part of the problem. Your dog’s response helps refine the assessment.

An older dog who starts soiling indoors needs an explanation and an achievable care plan. Cognitive decline may contribute, but assess it alongside urinary function, physical comfort, access, and other behavioural changes. Bring a clear history, pursue the recommended investigation, and arrange follow-up if the problem persists. Those steps offer a more useful response than assuming your dog has either become untrained or developed dementia.

References

Rafatpanah Baigi, S., Yang, C. C., Mondino, A., Fefer, G., Panek, W. K., Case, B. C., Griffith, E. H., Gruen, M. E., and Olby, N. J. (2026). The relationship between urinalysis abnormalities, soiling behavior, and cognitive decline in aging dogs. Journal of Veterinary Internal Medicine, 40(5), aalag208. DOI: 10.1093/jvimsj/aalag208

Kendall, A., Byron, J. K., Westropp, J. L., Coates, J. R., Vaden, S., Adin, C., Oetelaar, G., Bartges, J. W., Foster, J. D., Adams, L. G., Olby, N., and Berent, A. (2024). ACVIM consensus statement on diagnosis and management of urinary incontinence in dogs. Journal of Veterinary Internal Medicine, 38(2), 878–903. DOI: 10.1111/jvim.16975

Wrightson, R., Albertini, M., Pirrone, F., McPeake, K., and Piotti, P. (2023). The relationship between signs of medical conditions and cognitive decline in senior dogs. Animals, 13(13), 2203. DOI: 10.3390/ani13132203

Olby, N. J., Araujo, J. A., Gruen, M. E., Johnson, P., Kubinyi, E., Landsberg, G., Latimer, C. S., McGrath, S., McKenzie, B., Moreno, J. A., Tarantino, M., and Volk, H. (2026). The Canine Cognitive Dysfunction Syndrome Working Group guidelines for diagnosis and monitoring of canine cognitive dysfunction syndrome. Journal of the American Veterinary Medical Association, 264(4), 498–505. DOI: 10.2460/javma.25.10.0668

Vitturini, C., Cerquetella, M., Spaterna, A., Bazzano, M., and Marchegiani, A. (2025). Diagnosis of canine cognitive dysfunction syndrome: A narrative review. Veterinary Sciences, 12(8), 781. DOI: 10.3390/vetsci12080781