Yes dogs with dementia are suffering and slowly dying and they get confused and will usually forget who their owners are.
It's best to have a dog put to sleep when they have dementia and especially if they are getting too confused and some dogs with dementia may decide to snap at the owners if they forget who you are.
If they get to that point then putting the dog to sleep is best for the dog and you and your family as well.
Dogs can get dementia at any age but dementia in dogs is most common in dogs of age 8 to 12 years old.
As the dog gets older then they will usually suffer from dementia but not always.
If a dog has dementia it's usually best to put them to sleep as they are suffering and not living a good quality of life.
If I had dementia I would rather be put down as well.
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.
Some 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.
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.