Hels001 so….you are too young to retire yet…at the grand old age of 57 and you( only ) work part time but your daughter thinks you are too old now !! Have I read right? 
Does your daughter think perhaps that you will burden her with dog sitting duties? Just a? thought.
In my opinion your daughter should: (a) realise that people can get ill at any time and any age, (b) remember that they often as not recover again and (c) try to cultivate some empathy, as you are clearly feeling vulnerable because of your friends late stage cancer diagnosis and your older brothers’ serious illness.
If you believe your are up for a puppy and all that the first year will entail and that you, your other dog and finances will cope then you should go for it. ?
Labour Brings in excellent Renter's Rights - long overdue.

