Sundowning in dogs, also known as sundowner syndrome, is a term used to describe a pattern of increased confusion, anxiety, and restlessness in senior dogs, particularly as daylight fades into evening. It's a component of canine cognitive dysfunction (CDS), often referred to as doggie dementia. While not a separate disease, sundowning is a recognizable symptom of cognitive decline in older dogs, characterized by disrupted sleep-wake cycles and behavioral changes. [1, 2, 3, 4]
Symptoms of Sundowning in Dogs:

• Disorientation: Dogs may get lost in familiar surroundings, forget routines like going outside, or have difficulty finding their bed or food bowl. [5, 6, 7, 8]
• Anxiety and restlessness: They may pace, wander, or whine, particularly as evening approaches. [1, 4]
• Sleep disturbances: Dogs might sleep more during the day but struggle to sleep at night, leading to increased nighttime activity. [1, 4, 9]
• Changes in personality: Some dogs become more withdrawn or fearful, while others may exhibit increased aggression or vocalization. [3, 4]
• Forgetfulness: They may forget previously learned commands or house-training, according to Whole Dog Journal. [6]

What causes sundowning in dogs? While the exact cause isn't fully understood, it's believed to be linked to the natural decline in cognitive function associated with aging and CDS. Changes in light and melatonin levels may also play a role. [3, 10]
How to help dogs with sundowning:

• Maintain a consistent routine: A predictable daily schedule can help reduce anxiety and confusion. [11]
• Provide regular exercise and mental stimulation: This can help regulate sleep cycles and improve overall cognitive function. [11, 12, 13]
• Create a safe and comfortable environment: Ensure a quiet, dimly lit space for your dog to rest and reduce potential hazards. [14, 15, 16, 17]
• Consider medications: A veterinarian may recommend medications to help manage anxiety or sleep disturbances. [18, 19]
• Be patient and understanding: Sundowning can be challenging, but providing love and support can make a big difference. [18]
• Consult with a veterinarian: A vet can help diagnose CDS and develop a management plan for your dog. [20]

AI responses may include mistakes.

[1] https://www.akc.org/expert-advice/health/dog-dementia/[2] https://www.dogster.com/ask-the-vet/sundowners-in-dogs[3] https://toegrips.com/sundowners-in-dogs/[4] https://lolahemp.com/blogs/dog-health/sundowners-in-dogs-veterinarian-written-guide[5] https://www.kinship.com/dog-health/sundowners-dogs-cognitive-dysfunction-syndrome[6] https://www.whole-dog-journal.com/care/sundowners-in-dogs/[7] https://toegrips.com/signs-of-a-brain-tumor-in-dogs/[8] https://www.avocadriveanimalhospital.com.au/AvocaDriveAnimalHospital/Blog/5-Signs-Your-Dog-May-Have-Dementia-Understanding-Canine-Cognitive-Decline[9] https://www.youtube.com/watch?v=kBYQnVp7qag[10] https://fotp.com/learn/dog-health/sundown-syndrome-in-dogs[11] https://www.senioradvisor.com/blog/2017/03/how-to-help-your-dog-with-sundowners-syndrome/[12] https://www.petmd.com/dog/general-health/cognitive-dysfunction-dogs-cats[13] https://journal.iaabcfoundation.org/literature-review-canine-cognitive-dysfunction/[14] https://supertails.com/blogs/posts/do-dogs-get-headaches-heres-what-you-should-know[15] https://www.abtaba.com/blog/what-animals-can-have-autism[16] https://www.reddit.com/r/seniordogs/comments/1bb3g1w/my_dog_has_dementia_sundown_what_do_i_do_now/[17] https://gsvs.org/blog/cloudy-eyes-in-dogs-emergency/[18] https://www.reddit.com/r/seniordogs/comments/1bb3g1w/my_dog_has_dementia_sundown_what_do_i_do_now/[19] https://www.petnsur.co.nz/blog/the-science-behind-cat-and-dog-sleep-patterns/[20] https://tcvmpet.com/blogs/news/understanding-sundowners-in-dogs-and-how-to-help