I became a foster, rescue groups save pound dogs on the kill list from being killed & they ask for people to help, you mind them till they're adopted out BUT if you fall in love with them then you have 1st choice to adopt them that's how I ended up with my Patch.
I would go to the local pound & see which dogs I was drawn too, then I'd find out when will they be put to sleep then I'd contact my rescue group & get them to save the dog.