An adult Shikoku dog is seen in this file photo. (Mainichi/Karen Goto)


SAPPORO — Pet dogs are living longer than ever thanks to improved care, but with more pooches pushing past 10 years of age, there has also been a sharp rise in dog dementia cases, as well as interest in symptoms that closely mirror those in humans.


According to Mami Irimajiri, a 58-year-old veterinarian at the Tokyo University of Agriculture and Technology Animal Medical Center with expertise in canine behavioral issues, conditions in dogs similar to human Alzheimer-type dementia are referred to as “geriatric cognitive dysfunction” or “cognitive dysfunction syndrome.” Main symptoms include forgetting their owner, incontinence, becoming fearful, showing aggression, being unable to turn around or back up, and barking continuously at night. As the condition progresses, symptoms can worsen, with some dogs spinning in circles or wandering aimlessly.


Prevention strategies similar to those for humans


Are there measures that can be taken at home to prevent or alleviate symptoms? Irimajiri suggests, “Just like humans, it’s important to pay attention to exercise, brain training and diet.”


For exercise, it is not just about walks — activities like repeated sitting and standing or walking on soft cushions can also be beneficial. However, excessive exercise should be avoided.


For brain training, using “educational toys” such as those that dispense treats when rolled can be effective. Even without purchasing commercial products, household items like empty boxes can be used as substitutes. Additionally, dogs can learn new tricks even in old age, and engaging in enjoyable communication with humans can be therapeutic.


Regarding diet, comprehensive nutrition dog food is recommended. Rather than making a dog’s meals at home with no knowledge of nutritional genomics, it is safer to serve commercial dog food formulated to provide necessary nutrients based on the dog’s age.









Mami Irimajiri, a veterinarian at the Tokyo University of Agriculture and Technology Animal Medical Center, holds her pet dog in this photo provided by the individual.


Risk increases sharply after age 10


Irimajiri notes that canine dementia has long been recognized. However, with advancements in pet food and medical care and the increase in indoor living, there may be more awareness of dementia symptoms as dogs live longer.


According to research published in the British journal Scientific Reports, the prevalence of cognitive dysfunction in dogs is 28% at ages 11-12 and 68% at ages 15-16. The risk of developing dementia increases drastically after age 10, with the likelihood rising by about 68% each year.


Nevertheless, reviewing care environments and using supplements or medications can improve symptoms. Irimajiri emphasizes, “Overall, the key is to notice any changes early.”


(Japanese original by Haruka Ito, Hokkaido News Department)