My brother had a brindle Basenji he had to put down @ the age of 17 1/2 who also had dementia - he said the dog would get up @ night and walk into walls and scream. It was very sad and it was a very painful decision for him to let him go. His basenji Kahn was a relative of my Basenji Kembe - they shared the same great- grandmother but his basenji came from California and mine came from Connecticut.
My gorgeous girl, Roxie is about to be 6 years old Nov 12th. She is my first Basenji and has been a total delight. She seems more human than dog at times. Knowing your furbaby lived to 17 is wonderful and amazing. It gives me hope that my girl will be long lived too. All my previous dogs, huskies, shepards, and terriers lived 13-15 years. No matter the age it hurts to lose them. They own a big chunk of our heart. I can't bear to be alone when they have gone, so I adopt another very soon. Each one has their own special place in our heart. They fill our lives with joy, comfort and occasionally aggravation. They are family.
My prayers are with you. God bless.