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SESK: Stuff Everyone Should Know · sesk.info/dog-dementia-sleep

Which of these can be a sign of dementia in a senior dog?

Changes in sleep patterns, like being up at night.

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  1. Growing a shorter tail
  2. Changes in sleep patterns ✔
  3. Suddenly loving baths

Why: Older dogs can get senility, also called cognitive dysfunction. Signs include changes in sleep patterns, loss of housetraining, getting lost in familiar places and less interest in people.

Huh, didn't know that: Merck says physical and mental stimulation can slow down the signs of senility.

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A man was amazed to see his friend playing chess with his dog. That's the smartest dog I've ever seen! The friend said, Nah, I've beaten him three games out of five.
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References

Answer: Changes in sleep patterns. Older dogs can get senility, also called cognitive dysfunction. Signs include changes in sleep patterns, loss of housetraining, getting lost in familiar places and less interest in people.

  1. Merck Veterinary Manual, Behavior Problems in Dogs www.merckvetmanual.com/dog-owners/behavior-of-dogs/behavior-problems-in-dogs
    Signs include a decrease in social interaction, loss of housetraining, disorientation (getting lost in familiar surroundings), and changes in sleep patterns.
    Checked 2026-10-10.

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