# Dog Dementia: How to Tell If It's Sundowning or Something Else


## Key Takeaways

- Sundowning, characterized by increased confusion and restlessness in older dogs during evening and nighttime hours, is a common manifestation of Canine Cognitive Dysfunction Syndrome (CDS), the veterinary term for dog dementia.
- Differential diagnoses for nighttime restlessness are critical; conditions such as pain (e.g., arthritis), vision loss, hearing loss, and medical issues like chronic kidney disease (indicated by increased polydipsia and polyuria) must be ruled out by a veterinarian.
- Urgent veterinary intervention is required for signs including collapse, seizures, labored breathing, pale gums, persistent vomiting, or straining to urinate without production, as these indicate potentially life-threatening emergencies.
- A veterinarian's diagnostic approach involves a thorough physical examination, bloodwork, and urinalysis to identify underlying medical conditions, with CDS often being a diagnosis of exclusion based on history and clinical signs.
- Management of CDS may include prescription medications to improve cognitive function, specialized therapeutic diets, and environmental modifications such as nightlights and consistent routines to reduce disorientation and anxiety.
- Owners should maintain a detailed log of behavioral changes, including timing, duration, and specific actions, to provide objective data for veterinary assessment and to monitor treatment efficacy.

---

If your older dog paces at night, stares at walls, or barks at nothing after dark, you are likely watching a behavior called sundowning. Sundowning is a pattern of confusion and restlessness that gets worse in the evening and at night. It is common in dogs with cognitive dysfunction syndrome, which is the veterinary term for dog dementia. The good news is that many of these signs can be managed, and some causes of nighttime restlessness are treatable. The first step is knowing what you are seeing and when to act quickly.

Not every nighttime behavior change is dementia. Pain, vision loss, hearing loss, and medical conditions like kidney disease can all make a dog restless after dark. Some of those conditions are urgent. If your dog is struggling to breathe, collapsing, having a seizure, or vomiting repeatedly, do not wait for a vet appointment. Go to an emergency veterinary hospital now. For everything else, read on to learn how to tell the difference and what to do next.

## Is This an Emergency?

Use this table to sort what you are seeing. If you are unsure, call your veterinarian. They can tell you whether to come in right away.


<!-- figure:auto -->
```figure
{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to an emergency vet now",
   "signs": [
    "Collapse or inability to stand, seizure lasting more than two minutes or repeated seizures, labored breathing with visible belly movement, pale, white, or blue gums, vomiting that will not stop, a swollen, hard, or painful belly, straining to urinate with no urine produced"
   ],
   "action": [
    "Do not wait",
    "Call the emergency hospital on the way so they are ready"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Sudden blindness or bumping into walls that started today, a new limp or crying out when touched, drinking and urinating much more than usual, refusing food for more than 24 hours, a fall or injury from pacing or wandering"
   ],
   "action": [
    "Call your regular clinic when they open",
    "Tell them the specific signs and how long they have lasted"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for 24 to 48 hours",
   "signs": [
    "Pacing at night that started gradually, mild restlessness after dark, waking you once or twice at night, staring at walls or corners, mild confusion about doors or furniture, changes in sleep-wake cycle"
   ],
   "action": [
    "Keep a written log of behaviors, times, and triggers",
    "If signs worsen, or if new signs appear, move up to a same-day appointment"
   ]
  }
 ]
}
```

| Urgency level | Signs to look for | What to do |
|---|---|---|
| Go to an emergency vet now | Collapse or inability to stand, seizure lasting more than two minutes or repeated seizures, labored breathing with visible belly movement, pale, white, or blue gums, vomiting that will not stop, a swollen, hard, or painful belly, straining to urinate with no urine produced | Do not wait. Call the emergency hospital on the way so they are ready. |
| Book a same-day appointment | Sudden blindness or bumping into walls that started today, a new limp or crying out when touched, drinking and urinating much more than usual, refusing food for more than 24 hours, a fall or injury from pacing or wandering | Call your regular clinic when they open. Tell them the specific signs and how long they have lasted. |
| Watch at home for 24 to 48 hours | Pacing at night that started gradually, mild restlessness after dark, waking you once or twice at night, staring at walls or corners, mild confusion about doors or furniture, changes in sleep-wake cycle | Keep a written log of behaviors, times, and triggers. If signs worsen, or if new signs appear, move up to a same-day appointment. |

## What Is Sundowning in Dogs?

Sundowning is not a disease itself. It is a cluster of behaviors that appear or worsen in the late afternoon and evening. A dog who seems fine all day may start pacing, whining, circling, or getting "stuck" in corners after the sun goes down. Some dogs forget house training at night. Others bark at nothing or seem to not recognize family members in dim light.

This pattern happens because of changes in the brain. In cognitive dysfunction syndrome, or CDS, the dog's brain accumulates abnormal protein deposits and loses nerve cells over time. The result is a decline in memory, learning, and awareness. The [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners) describes CDS as a gradual condition that affects older dogs, with signs that often include disorientation, changes in social interaction, and altered sleep cycles. The confusion tends to spike at night partly because there is less light, fewer familiar sounds, and more quiet, which can be disorienting for a dog with failing senses and memory.

## What Else Could Cause Nighttime Restlessness?

Before assuming dementia, consider other common causes. Pain is a major one. Arthritis in the hips, knees, or spine can make a dog uncomfortable when lying still, so they pace or shift position all night. Dental pain can do the same. Vision loss from cataracts or retinal disease makes a dog unsure of their surroundings, especially in the dark. Hearing loss removes the familiar cues that reassure a dog at night.

Medical conditions can also drive restlessness. Chronic kidney disease makes dogs drink and urinate more, which means they need to get up at night. The [International Renal Interest Society Staging Guidelines](http://www.iris-kidney.com/guidelines/) explain that increased thirst and urination are hallmark signs of kidney disease in older dogs. An enlarged bladder or a urinary tract infection can cause the same nighttime waking. Dogs with Cushing's disease, diabetes, or an overactive thyroid may also be restless, hungry, or thirsty at odd hours.

## How to Tell Dementia Apart From Other Causes

Look at the whole pattern, also one night. Dementia signs are usually gradual and progressive. A dog with CDS may forget commands they have known for years, get lost in familiar rooms, or stare blankly at a wall. They may greet you with less enthusiasm or seem to forget you were just in the room. These changes happen during the day too, even if they are more obvious at night.

Pain and medical issues tend to have clearer physical signs. A dog with arthritis may hesitate before standing, limp, or cry out when getting up. A dog with kidney disease will drink noticeably more water and need more bathroom breaks. If your dog is restless only at night but seems bright and comfortable during the day, dementia is more likely. If your dog is restless and also showing physical signs like limping, excessive thirst, or vomiting, a medical problem is more likely.

The [AAHA Senior Care Guidelines for Dogs and Cats](https://www.aaha.org/resources/2023-aaha-senior-care-guidelines-for-dogs-and-cats/) recommend that all senior dogs have a thorough examination at least every six months. This matters because many conditions that look like dementia, including pain, kidney disease, and vision loss, can be treated or managed once they are identified. A veterinarian can run blood work, check blood pressure, examine the eyes, and feel the joints to rule out these other causes. That examination is the only reliable way to know what is driving your dog's nighttime behavior.

## What Happens Next

If your veterinarian diagnoses cognitive dysfunction syndrome, treatment is available. There are medications that can improve brain function in some dogs, and the dose must be determined by your veterinarian based on your dog's weight, health, and other medications. Never give your dog a human dementia drug. There are also prescription diets and supplements designed to support brain health in older dogs. Your veterinarian will recommend a plan based on your dog's specific situation.

You can also make changes at home tonight. Leave a dim nightlight on in the rooms your dog uses. Keep furniture in the same place. Take your dog out for a final bathroom break right before bed. Try a consistent bedtime routine with quiet, calm activities. These small adjustments often reduce nighttime confusion while you wait for your veterinary appointment.

## What You Can Do at Home Right Now

If your dog is pacing, whining, or restless at night, your first job is to keep them safe and calm. Do not try to diagnose this alone. Some causes of nighttime restlessness, such as pain from arthritis, a full bladder from kidney disease, or a sudden drop in blood sugar, need a veterinarian's input. If your dog is also vomiting, collapsing, having trouble breathing, or seems unable to stand, stop reading and go to an emergency clinic now.

For the dog who is simply restless and confused, start with these steps tonight. Keep the environment boring and predictable. Turn off the television and lower the lights. Speak in a low, steady voice. Do not scold or correct a confused dog. They are not being stubborn. They genuinely do not understand what is happening.

Move any furniture that could trap them. Block stairways with a baby gate if your dog has ever fallen. Put a nightlight in the hallway so they can see where they are going. A dog who cannot see well in the dark will pace more. Leave a worn t-shirt that smells like you near their bed. Familiar smells are grounding.

Do not give any human sleep aids, melatonin, or over-the-counter calming supplements without explicit instructions from your veterinarian. Some of these interact with other medications. Some are dangerous in dogs with liver or kidney disease. The dose for a dog is not the dose for a person, and the wrong amount can cause wobbling, vomiting, or a dangerously slow heart rate. Your veterinarian must determine the dose and the product.

Do not increase your dog's water intake at night to "flush them out." That will only make them need to urinate more, which wakes them again. Do not feed a large meal late in the evening. A full stomach can cause discomfort and restlessness. Instead, offer a small, plain snack earlier in the evening if your dog is used to eating twice a day.

## What to Write Down Before You Call the Vet

Before you phone or visit, gather facts. Write down what you see, not what you guess. Count things. Time things. This information helps the veterinarian separate dementia from other problems.

Keep a notebook by your bed for three nights. Record the time your dog first wakes. Note how long the episode lasts. Write down what your dog does. Do they pace in circles? Stare at a wall? Walk into a corner and stand there? Whine or bark? Pant heavily? Ask to go outside repeatedly?

Also note what helps. Does your dog settle when you walk with them? Do they stop if you turn on a light? Do they seem to recognize you, or do they look through you? Do they eat a treat if offered, or do they ignore food entirely?

Measure your dog's breathing rate at rest. Count breaths for 15 seconds while they are asleep and multiply by four. A normal resting rate is usually between 10 and 30 breaths per minute. If it is above 40, or if your dog is breathing with their belly muscles straining, that is not dementia. That needs urgent care.

Check their gum color. Lift the lip and look. Healthy gums are pink, like bubblegum. Pale, white, blue, or brick-red gums are emergency signs. So is a dog who cannot stand, who has a seizure, or who cries out in pain when touched.

## A Symptom Comparison Table

Use this table to organize what you are seeing. It is not a diagnosis. It is a tool for describing your dog's behavior clearly to a veterinarian.

| Sign | More typical of dementia | More typical of a medical problem |
|---|---|---|
| Pacing at night | Aimless, no clear goal, stops when walked | Pacing with panting, restlessness despite exhaustion |
| Whining or barking | Starts for no reason, stops when spoken to | Persistent, louder with movement, or with urination |
| Staring at walls | Common, dog seems "absent" | Rare, unless vision loss is severe |
| Getting stuck in corners | Stands facing the corner, cannot turn | Sudden inability to turn, falling, head tilt |
| Asking to go out | Goes out, does nothing, comes back in | Strains to urinate, produces little or no urine |
| Eating | Eats normally, may forget they ate | Refuses food, vomits, drools excessively |
| Recognition | Wavers, sometimes knows you, sometimes not | Sudden aggression or fear of familiar people |
| Pain signs | Unusual, not typical of dementia | Limping, flinching, crying when touched, stiff gait |

If your dog is straining to urinate and producing nothing, that is a blockage. That is an emergency. Do not wait for a vet appointment. Go to an emergency clinic immediately.

## Creating a Calming Nighttime Routine

Dogs with cognitive dysfunction syndrome, the formal name for dog dementia, do best on a rigid schedule. Their internal clock is failing. Your routine becomes their clock.

Set a fixed bedtime and wake time. Keep it the same every day, including weekends. Move feeding to the morning and early afternoon. The last meal should be at least four hours before bed. Take your dog for a short, gentle walk in the early evening. This is not for exercise. It is for mental reset and a chance to empty their bladder.

Thirty minutes before bed, dim the lights. Stop all play. No tug toys, no chasing. Offer a quiet chew or a food puzzle with a few treats. This gives their brain a simple, repetitive task. Then take them outside one last time. Use the same words every night, such as "go potty" and "bedtime." Say them in the same tone.

Place their bed in the same spot every night. If they pace, do not chase them. Sit quietly near them. Speak softly. Some dogs settle if you place a hand on their back. Others prefer to be left alone. Watch your dog and follow their lead.

Do not add new supplements or medications to this routine without veterinary approval. Some prescription diets and medications genuinely help dogs with dementia, but they must be chosen and dosed by a veterinarian. The [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners) explains that cognitive dysfunction is a diagnosis of exclusion, meaning other conditions must be ruled out first.

## What a Veterinary Visit Usually Involves

Expect a long appointment. The veterinarian will ask about your dog's history, daily routine, and the specific behaviors you have recorded. Bring your notebook. Bring a video of the nighttime behavior if you can. A video is often more useful than a verbal description.

The veterinarian will perform a full physical exam. They will listen to the heart and lungs, feel the abdomen, check the eyes for cataracts or retinal changes, and test your dog's reflexes. They will likely recommend bloodwork and a urine test. These check for kidney disease, liver problems, thyroid issues, and diabetes, all of which can cause confusion or restlessness. The [International Renal Interest Society Staging Guidelines](http://www.iris-kidney.com/guidelines/) describe how chronic kidney disease is staged and managed, and kidney disease is a common cause of increased thirst and nighttime urination in older dogs.

The veterinarian may also check blood pressure. High blood pressure can cause vision loss and behavioral changes. If the physical exam and bloodwork are normal, the veterinarian may diagnose cognitive dysfunction based on your dog's history and signs.

Cost varies widely by region and clinic. A basic exam with bloodwork and urine testing typically falls in the range of $150 to $400. Add imaging such as X-rays or an ultrasound, and the cost can rise to $500 or more. These are general ranges only. Your clinic can give you a specific estimate before testing.

## When an Online Vet Can Help, and When It Cannot

Some situations in this article require hands-on care and must never be handled remotely. If your dog is straining to urinate, cannot stand, has pale gums, is seizing, or is breathing rapidly at rest, an online consultation cannot help. Those are emergencies. Go to a clinic in person.

For an early or mild case of nighttime restlessness, a remote consultation is genuinely useful. If your dog is otherwise eating, drinking, and moving normally, an online veterinarian can take a detailed history, watch a video of the behavior, and advise whether a visit is warranted. They can also answer a medication side effect question or help you adjust a calming routine for a dog already diagnosed with dementia.

A remote veterinarian can see what you show them on video. They can hear your dog bark or whine. They can ask questions and give advice. In many states they can prescribe certain medications. But they cannot palpate the abdomen, listen to the chest, take a temperature, run bloodwork, or image anything. They cannot feel a painful joint or hear a heart murmur. Prescribing rules differ by state, and a veterinarian may require an in-person examination before prescribing anything for a new problem.

Use remote care for triage and follow-up. Use in-person care for diagnosis and emergencies. The [American Veterinary Medical Association Pet Owner Resources](https://www.avma.org/resources-tools/pet-owners) and the [AAHA Pet Owner Resources](https://www.aaha.org/for-pet-parents/) both emphasize that a physical examination is the foundation of veterinary care. If you are unsure which you need, ask the online vet directly. They will tell you if your dog needs to be seen.

## Common Mistakes Owners Make With Sundowning

Many owners accidentally make the nighttime worse without realizing it. The most common mistake is responding to a confused dog with excitement or frustration. If you rush over, raise your voice, or try to physically steer your dog back to bed, you can raise their anxiety. A frightened, confused dog cannot settle.

Another frequent error is changing the routine every night. Dogs with cognitive dysfunction syndrome, the medical name for dog dementia, rely on predictability. If bedtime, feeding time, and walk time shift daily, their internal clock has nothing to hold onto. Keep the schedule identical even on weekends.

Owners also mistake thirst, hunger, or a full bladder for pure confusion. An older dog who paces at 2 a.m. may simply need to urinate. Before assuming dementia, check whether your dog has access to water, has had a recent potty break, and is not in pain from arthritis. Pain is a major cause of nighttime restlessness that is easily overlooked.

A dangerous mistake is assuming all nighttime waking is dementia. Some causes are urgent. If your dog is panting heavily, vomiting, has a swollen belly, or cannot settle despite obvious exhaustion, do not wait for morning. These can signal bloat, heart failure, or another emergency. Call your emergency veterinarian immediately.

| Common Mistake | Better Action |
| --- | --- |
| Scolding or shushing a confused dog | Speak softly, use a calm phrase like "it's okay," and guide gently |
| Changing bedtime or feeding times daily | Keep the same schedule every single day |
| Assuming pacing is always dementia | Check for pain, thirst, or the need to urinate first |
| Giving leftover human sleep medication | Ask your vet about safe options designed for dogs |
| Ignoring heavy panting or a swollen belly | Treat these as emergencies and call the vet right away |

## How to Reduce the Chance of It Happening Again

You cannot cure dementia, but you can slow its progression and reduce the frequency of sundowning episodes. Start with a veterinary workup. Many dogs have underlying conditions that worsen confusion, such as chronic kidney disease or dental pain. The American Animal Hospital Association senior care guidelines recommend regular health assessments for older pets to catch these issues early.

Keep your dog physically and mentally active during daylight hours. A tired dog sleeps better. Short walks, gentle play, and simple nose games can help. Avoid overstimulation in the evening. Turn off loud television, keep lights dim, and stop exciting play at least an hour before bed.

Consider whether your dog's environment is confusing at night. A dog who cannot see well may panic in the dark. Leave a dim nightlight on. Keep furniture in the same place. Block off stairs or other dangerous areas with baby gates. Some owners find that a familiar shirt or blanket with your scent helps their dog feel secure.

Talk to your veterinarian about treatment options. There are prescription medications and veterinary diets designed to support brain function in dogs with cognitive dysfunction. Your vet will determine the right choice and dose for your dog. Never give human sleep aids. Many are toxic to dogs or cause the opposite effect.

## What Ongoing Management Usually Looks Like

Dementia is a progressive condition, which means it typically worsens slowly over months or years. There is no cure. The goal is quality of life, not reversal. Most dogs can live comfortably for a long time with good management.

You may see improvement within a few weeks of starting treatment. Some dogs respond to dietary changes and enrichment alone. Others need medication. Your veterinarian will adjust the plan based on how your dog responds. Expect to check in regularly, usually every few months, to review progress.

Some nights will be better than others. A bad night does not mean treatment failed. Stress, weather changes, or a minor illness can trigger a flare-up. Keep notes on what helped and what did not. Share these notes with your vet.

The hardest part is knowing when quality of life has declined too far. Watch for signs like your dog no longer eating, losing the ability to recognize family members, getting stuck in corners for hours, or seeming distressed most of the time. The American Veterinary Medical Association offers guidance on end-of-life decisions and working with your veterinarian to make compassionate choices. You do not have to make this decision alone.

## Frequently Asked Questions

**Can sundowning be reversed?**

Sundowning itself is a symptom, not a disease. If it is caused by dementia, it will not fully reverse, but it can be managed. Many dogs have fewer and milder episodes with a consistent routine, environmental changes, and veterinary treatment. If the restlessness is caused by something else, like pain or a urinary tract infection, treating that condition may stop the sundowning completely. Your veterinarian needs to determine the cause first.

**Is my dog in pain when they pace at night?**

Not always, but pain is a common cause of nighttime restlessness. Arthritis is especially common in older dogs. Watch for signs like stiffness when standing, reluctance to climb stairs, or flinching when touched. If you suspect pain, do not guess. Your veterinarian can assess your dog and recommend safe pain relief. Never give human pain medication, as many are dangerous or fatal to dogs.

**How long can a dog live with dementia?**

Many dogs live for years after a dementia diagnosis. The condition progresses slowly, and the timeline varies widely between individuals. What matters most is quality of life. A dog who still eats, enjoys gentle attention, and has more good days than bad can have a good life. Work with your veterinarian to reassess regularly and adjust care as the condition changes.

**Should I wake my dog during a sundowning episode?**

No. If your dog is safely resting, even if they are awake and staring, leave them alone. Interrupting can increase confusion and anxiety. Only intervene if your dog is in danger, such as pacing near stairs, trying to escape, or injuring themselves. In those cases, use a soft voice and gentle guidance. Do not grab or startle them.

**Will a nightlight actually help?**

For many dogs, yes. Older dogs often have vision loss, and sudden darkness can be disorienting. A dim nightlight in the hallway or bedroom helps your dog navigate and recognize their surroundings. It is a simple, low-cost change that can reduce nighttime panic. Keep the light consistent every night so it becomes part of the routine.

**When should I consider euthanasia for a dog with dementia?**

This is a deeply personal decision. Consider euthanasia when your dog has more bad days than good, no longer finds joy in food or familiar people, cannot move without getting stuck, or seems anxious or distressed most of the time. Your veterinarian can help you assess quality of life honestly. The MSD Veterinary Manual Pet Owner Version provides guidance on recognizing suffering and making end-of-life decisions. You do not have to decide alone.

## Related Clinical & Scientific Guides

* [How to Help Your Senior Cat with Mobility Issues: Tips and Products](/knowledge/veterinary-medicine/senior-and-chronic-care/senior-cat-mobility-help)
* [How to Prepare Your Cat for a Vet Visit for Kidney Disease](/knowledge/veterinary-medicine/senior-and-chronic-care/prepare-cat-vet-visit-kidney-disease)
* [What Blood Tests Does My Senior Dog Need and What Do They Cost?](/knowledge/veterinary-medicine/senior-and-chronic-care/senior-dog-blood-tests-cost)


## References and Further Reading

- [AAHA Senior Care Guidelines for Dogs and Cats](https://www.aaha.org/resources/2023-aaha-senior-care-guidelines-for-dogs-and-cats/)
- [International Renal Interest Society Staging Guidelines](http://www.iris-kidney.com/guidelines/)
- [AVMA Pet Owner Resources](https://www.avma.org/resources-tools/pet-owners)
- [MSD Veterinary Manual Pet Owner Version](https://www.msdvetmanual.com/pet-owners)
- [AAHA Pet Owner Resources](https://www.aaha.org/for-pet-parents/)

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> This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.