I agree @Junkmail, this is not resolved. The daughter has a lot to deal with.
Many families in my experience grossly underestimate the needs of a loved one with dementia for the sake if letting them stay independent that bit too long. If they are not properly aware of the wandering at night or incidents like this with the dog, then sadly they don't get the full picture of the person's true deterioration.
When they are alone is when they are the most vulnerable after all. I've met many many elderly men and women living alone or with their equally elderly spouse, totally unable to cope, empty cupboards, literally starving themselves and living in the freezing cold and the dark. Partly dementia, partly age, partly historical "make do" and don't waste things mentality.
They will all too often refuse carers, refuse support and refuse all offers of help, which is their right... but if they literally no longer have the mental capacity to make decisions on their own best interests then the decisions can be made for them by others. At that point, Social Services, the NHS etc will step in with the wider family if they have to, to keep people alive.
I recall returning one very old and almost emaciated lady to her freezing home with no gas or electricity on her key meters and no emergency money left on them either. After an ambulance check over in the street, they had said she had no need to go to hospital. My colleague and I got £60 from petty cash, topped the key meters up, bought milk, bread, eggs, tins of soup, tea, sugar, cheese, butter, a few other bits of food for her cupboards and a bunch of flowers and took them to her house. Made her tea, scrambled egg on toast and put the flowers out for her. Put an emergency referral in to Social Services, Salvation Army and Age Concern (as it was) who visited her the next day. That was as much as we could muster. This happens all over the country to some degree or other.