... Now we care for three "occasional" cats. They were abandoned ... they'd been fed since kittenhood, human dependent, been "fixed" but were kept outdoors. They've now been with us for a few years, .... they're not house cats. They do NOT like being kept indoors. .....
Yeah, you just can't predict.
Two of our crew were feral. They'd been TNR'd as kittens but living in parking lots and roaming an industrial complex by a freeway for years.
The first one we snagged because coyotes were devastating the colony and she was the only one that would let anybody close enough to grab her. Tossed her in the carrier and it was like in a Tasmanian Devil cartoon. The whole carrier was bouncing around the back of the car. Thought she was going to tear it apart. By the time we got her to the vet she was calm. Get her home and she went from scaredicat to snugglebug in a few days. Now she's a total house princess and never wants to leave the upstairs bedrooms, let alone go outside.
A couple of years later one of the parking lot boys gets into a scrap with a raccoon. He was easy to pick up, being nearly half dead. After his days at the vet we weren't about to put him back out with the coyotes. He settled in within a few hours. Shows zero interest in going outside.
..... I'm an idiot, BTW, when it comes to cats or dogs.
We lucked out with the last dog we found dodging cars on a busy street. No tags, not chipped, showed no signs of recognizing any houses when we got her leashed (we keep leashes in the cars for such occasions) and walked her around the neighborhood where we found her.
Great little girl, but our current cat heard isn't dog conditioned so we weren't in a position to keep her. Got her checked out, vaccinated and chipped at our vet and got super lucky. One of the techs fell in love with her. Now she's got a great home.