OldMeg - I agree, we can't save all dogs or indeed all children or people in need or animals in need. We have to toughen up and do what we can I suppose.
Recently, we visited a theme park in Devon. It included a small animal zoo. There were small furry animals, feathered animals - all fine. They also had an enclosure with several of the most depressed wolves in the history of wolf kind. They lay together, ribs showing, they'd done that thing that captured people do, that is, lost the will to escape, to attack anybody. It was awful.
Not as bad though as the next large enclosure. It contained a male Lion, a 'small' breed. This beast walked the length of its enclosure endlessly. His mental health was absolutely compromised. I found myself, wickedly, feeling that if he attacked his keeper with a view to chasing the keeper, bringing the keeper down and eating him/her, I'd have cheered the Lion on. Shocking of me I know.
We wandered on, encouraging our toddlers to walk and see the penguins. We didn't reach the penguins because a small pool containing 3 seals was just around the corner. these beautiful creatures swam round round, round and round again a pool big enough for a few carp. It finished us all off and we went to see the rubber dinosaurs roar, again. Much less distressing.
Sorry folks. I went well of piste there