I can speak from a UK charity - son used to work in a workshop in the Countryside.
They saw a very thin, stray hairy Collie/herding type dog running around, and over the days decided to try to catch her.
One of them went to the farm shop and got some dog food, and put the wet food in one of the barns- she eventually went in and they slowly closed the door.
She was fine {they are all men there} when people approached her without looking directly at her, and she was able to be caught and was taken to the local dog's home.
One of there lads said if she wasn't claimed, he'd love to have her.
Every day he phoned the dog's home, to see if she'd been claimed.
They knew he wanted to adopt her {this was pre Covid era}
On the Eighth day she was PTS.
She had failed a temperament test.
The lads were really upset- son said ''Wendy'' as they'd named her was nervous if you loomed over her, but not if you approached low without looking.
Poor Wendy.
No one knew her background- for all we know, she could have been a foreign rescue who was released, or who had ''bolted'' as so many do.
The Dog's home said she wouldn't be ''safe''- so goodness knows what their temperament testing consists of, or how they fail.