Yes and no. I discovered a racoon wandering around my work during the day, turns out he had distemper and eventually animal control came to collect him. I did my best to make his last day comfortable though.

Then there was another time I found a big ol’ German shepherd/Labrador mix wandering around my neighborhood. We took him in, tried many times to find his owners (we even got the phone number on file for whoever chipped him but they hung up immediately as soon as we brought it up) but eventually he became ours. Sadly, he was only with us for about a couple weeks before peacefully passing away out of nowhere (on Christmas Eve no less)