Has anyone out there had a dog diagnosed with Canine Dementia (also called Canine congitive disorder)?

My Weimie is now almost 10 years old and has had several health issues in the last 6 mos. We had a scare with bloat 5 mos ago and as a result of that found out he had a thyroid problem which he now takes meds for.

Recently he decided to eat a small pocket sized notebook, thank goodness he did not eat the spiral wire part. This is very odd behavior for him to eat anything like that. When he was a pup he ate everything and anything he could but he hasn't done that in years. My vet said it could be early signs of dementia or even possibly a sign of the big "c". I was just wondering if anyone else had a dog with dementia, how they diagnosed it, what symptoms their dog experienced as well as treatment.

Thanks!!!