Yes dogs can and do die from dementia because most times the dog is nearing the end of their life anyway by the time the dog does get dementia.
Although it's not the actual dog dementia that kills the dog as dog dementia is not usually fatal on its own, however the cognitive dysfunction and physical health problems are a debilitating combination that are what actually cause the death in dogs when they suffer from dementia.
Some common signs and symptoms of dog dementia are the dog will start pacing, be confused, stare at walls, sleep disturbances, howling, barking or whining constantly and the dog may become disoriented and get lost.
Dementia is usually slow at first in dogs but then later progresses at a much faster rate.
Dog dementia is usually slow to progress at first and then in the second and third stages of dog dementia it seems to progress much more quickly.
Dogs can get dementia at any age but most dogs don't suffer from dementia until more near the end of their life.
Not all dogs get dementia but some do.
The age at when most dogs get dementia is around 10 to 12 years of age depending on the dogs lifespan.
If the dogs lifespan is around 13 to 15 years then the dog may get dementia when they are 10 to 12 years old and continue to have the dog dementia until they die.
If the dogs lifespan is around 20 years then they may get the dog dementia at around age 15 years old if they are gonna get it.
Not all dogs get dementia as they age just like not all humans get dementia in old age but dog dementia is pretty common.
If you notice your dog is getting confused or you notice signs of the dog developing dementia such as circling, wandering and house soiling then your dog likely has dementia especially if they are nearing the end of their life.
A few other symptoms of dog dementia include include lethargy, sleep disorders, decreased learning and vocalizing.