Every dementia suffer is different and will react differently to different situations.
However, they have one thing in common. Instead of learning from, and enjoying, new experiences, they are slowly un-learning about the world. Towards the end even the 'familiar' seems new and frightening. Every day will be 'a holiday' in a new place and without the ability to work out where things are or how to get home.
I found it helped to sit quietly on my own some times and try imaging that don't know where I am, I recognize the blank TV but not the control, the strange dog near the door - it's very big - is it dangerous?
If you try and be your Caree you will find it much easier to decide what is the right thing to do.