Currently only two of my critters are rescues, my half doberman/half german shepherd - Duke. The other is one of my ferrets - Dante. Got him from a pet store, he had been mistreated and manhandled. His tail is broken in 2 places and he is missing a toe, was terrified of humans when I got him. They were going to put him in the feeder freezer to kill him but I bought him. They still charged me $140.00 regular price. GRR.
All of my horses were purchased but as rescue cases, last chance before the slaughter house for random issues. I retrained 3 horses and resold them to good families. I'm taking time off from the equine world to heal from the last, and worse, horse. My beloved Apollo, a young TWH stallion who had learned growing up that biting and kicking were highly effective ways of making humans leave him alone (he'd been abused)
I've rescued lots of critters from random places. Mostly dogs, though. I rescue, rehab, and find homes for "hopeless cases."
It is very fun and very rewarding work.