The 7 PM Shift
It starts around dusk. Your dog, who was calm and comfortable all afternoon, begins pacing. Back and forth through the house, sometimes whimpering, sometimes panting. They seem restless but don't want to go outside. Don't want to eat. Don't want to be petted. They just... move. And it goes on for hours.
If this sounds familiar, your dog may be experiencing sundowning. And while it's distressing to watch, understanding what's happening and what you can do about it makes a real difference.
What Sundowning Is
Sundowning is a phenomenon where confusion, agitation, and restlessness worsen in the late afternoon or evening. It's well documented in humans with Alzheimer's disease and dementia, and it occurs in dogs with Canine Cognitive Dysfunction as well.
The exact mechanism isn't fully understood, but several factors are thought to contribute:
- Circadian rhythm disruption. The aging brain, especially one affected by cognitive dysfunction, has difficulty regulating the internal body clock. The transition from light to dark may trigger confusion in a brain that can't properly process the shift.
- Melatonin depletion. Melatonin, the hormone that regulates sleep/wake cycles, is produced in response to darkness. Dogs with cognitive decline often have impaired melatonin production, leading to evening confusion instead of sleepiness.
- Fatigue. By evening, a cognitively impaired brain has been working hard all day to compensate for declining function. Mental fatigue may reduce the brain's ability to maintain orientation and calm.
- Reduced sensory input. As light fades, visual information decreases. For a dog with already impaired cognitive processing, the reduction in sensory cues may be disorienting.
- Cortisol fluctuations. Cortisol levels naturally peak in the morning and decline through the day. In dogs with CDS, this pattern may be disrupted, contributing to evening anxiety.
What It Looks Like
Sundowning behaviors in dogs can include:
- Pacing, often in repetitive patterns
- Whimpering, whining, or barking with no apparent cause
- Panting in the absence of heat or exertion
- Restlessness and inability to settle
- Increased clinginess or, conversely, withdrawal
- Staring at walls or into space
- Appearing lost or confused in familiar areas
- Trying to hide in unusual places
These behaviors typically start in the late afternoon or early evening and can last for hours. Some dogs experience sundowning every night. Others have it intermittently.
What You Can Do
There's no magic fix for sundowning, but a combination of approaches can reduce its severity and frequency.
Light Therapy
Bright light exposure during the day, particularly in the afternoon, can help regulate circadian rhythm. Take your dog outside for a 15 to 20 minute walk or sit in a sunny spot during the mid afternoon. As evening approaches, gradually reduce light levels rather than having a sudden shift from bright house lights to dark.
Some owners find that keeping lights on slightly longer in the evening and using dimmer switches for a gradual transition helps their dog. The goal is to minimize the abrupt day to night shift that seems to trigger the behavior.
Evening Routine
A consistent, predictable evening routine provides a cognitive anchor for disoriented dogs. Same activities, same order, same time. Dinner at 5:30. A gentle walk at 6. Settling on the couch at 6:30. Calm music or television. Bedtime routine at 9. The predictability reduces the cognitive load of figuring out what's happening and what's expected.
Calming Strategies
- White noise or calming music. Studies have shown that classical music, particularly pieces with a slow tempo and simple structure, can reduce anxiety in dogs. Sound also provides consistent sensory input that may help ground a disoriented dog.
- Compression garments. Anxiety wraps (like Thundershirts) provide gentle, constant pressure that has a calming effect on many dogs.
- Pheromone diffusers. Adaptil diffusers release a synthetic version of the nursing pheromone that some dogs find calming. Evidence is mixed, but they're safe and inexpensive to try.
- Gentle contact. Slow, rhythmic petting along the spine or gentle massage can help some dogs settle. Others prefer to be left alone during episodes. Follow your dog's cues.
Nutritional and Supplement Support
Melatonin supplements (at appropriate doses determined by your vet) can help regulate sleep/wake cycles. Some dogs respond well to melatonin given 30 minutes before the typical sundowning onset time.
Medium chain triglycerides (MCTs) provide the brain with an alternative energy source and have shown benefit in dogs with cognitive dysfunction. Coconut oil is a natural source.
Antioxidant support helps combat the oxidative stress that contributes to cognitive decline. A diet rich in antioxidants, combined with supplements that support cellular health (like NAD+ precursors), may help maintain brain function. I've been using LongTails for my own dog Kavi, primarily for the Nicotinamide Riboside, which supports the cellular energy production that aging neurons desperately need.
Medication
For dogs with severe sundowning that significantly impacts quality of life for the dog and the family, pharmaceutical intervention may be appropriate. Options include:
- Trazodone for evening anxiety
- Selegiline (Anipryl) for overall cognitive support
- Gabapentin for calming if pain is a co-factor
These should be discussed with your vet, who can assess your dog's specific situation and any interactions with other medications.
Environmental Management
- Remove obstacles from pacing paths to prevent injury
- Use nightlights to provide consistent low level illumination
- Create a safe, enclosed area where your dog can pace without getting stuck behind furniture or falling down stairs
- Keep water easily accessible during pacing episodes
Taking Care of Yourself
I'm going to be direct about something: sundowning is exhausting for the humans too. Listening to your dog pace and vocalize for hours every evening is emotionally and physically draining, especially when it disrupts your sleep.
Your needs matter. If you need to confine your dog safely to a room while you sleep, that's okay. If you need to run a fan or white noise machine so you can rest, that's okay. You cannot care for a cognitively impaired dog if you're running on empty yourself.
Seek support from your vet, from online communities of people going through the same thing, and from friends and family who understand what you're dealing with. This is hard. You're not failing because it's hard.
When It Gets Worse
Sundowning tends to progress along with the underlying cognitive dysfunction. If your current management strategies stop working, go back to your vet. There may be adjustments to try. But also be prepared for the conversation about quality of life. A dog who is confused and distressed for hours every evening is not having a good evening. That matters in the overall assessment of their daily experience.
You'll know when the balance tips. Trust yourself. And know that managing sundowning as well as you have, for as long as you have, is an act of profound love.
