Aging dogs and Sundowning syndrome 

Have you ever noticed your dog becoming unusually restless, anxious, or confused just as the sun begins to set? Maybe they pace the house, seem unsettled, or vocalize more than usual in the evening hours. While it can be easy to dismiss this as a quirk of aging, these behaviours may point to Sundowning syndrome. 

Often linked to Canine Cognitive Dysfunction (dog dementia), Sundowning syndrome affects some older dogs in ways that mirror dementia in humans. It can impact memory, awareness, and daily routines, particularly later in the day. However, not every dog with this condition will experience these symptoms, and their severity can vary from mild to more disruptive.  

Signs to watch for 

Symptoms can vary, but common behaviours include: 

• Pacing or wandering, especially in the evening 

• Increased vocalization (barking, whining) without clear reason 

• Disorientation or appearing “lost” in familiar spaces 

• Changes in sleep patterns, such as waking frequently at night 

• Increased anxiety, clinginess, or agitation 

• House training regression 

These behaviours can be distressing for both pets and their families but recognizing them early is key to providing support. 

How is it treated? 

While there is no cure for Sundowning syndrome, there are several ways to manage symptoms and improve your dog’s quality of life: 

• Veterinary Care: A veterinarian can rule out other medical issues and may recommend medications or supplements that support brain health and reduce anxiety. Some recommended supplements include polyunsaturated fatty acids DHA and EPA (a.k.a. Omega 3s). 

• Consistent Routine: Keeping feeding times, walks, and bedtime consistent can help reduce confusion. 

• Environmental Adjustments: Ensure your home is well-lit in the evening and minimize changes to your dog’s environment. Familiar spaces provide comfort. 

• Mental Stimulation: Gentle enrichment activities, like puzzle toys or short training sessions can help keep your dog’s mind engaged. 

• Comfort and Reassurance: Provide a calm, quiet space for your dog to rest, and offer reassurance during periods of anxiety. 

You’re not alone 

Caring for a senior dog with cognitive changes can be challenging, but support is available. If you notice these signs in your pet, consult your veterinarian for guidance and resources. 

Every stage of your pet’s life deserves compassion and care. With patience, understanding, and the right support, dogs experiencing Sundowning syndrome can continue to live comfortable, meaningful lives. 

If this information was helpful, please help us continue to educate about pet health and well-being by making a donation. As a registered charity that does not receive annual government funding, the Ontario SPCA and Humane Society depends on the generosity of donors to change the lives of animals in need.