Mine came from a no-kill and was clearly mistreated - he was nine months old and weighed 13 pounds and used to eat his own excrement (big sign of malnutrition). He’s mellowed with age, but there was a time when he was a handful. He’s come a long way and has been through a lot, but his memory is sharp - so I’m sure he well recalls whatever it was he went through, knows he has a good thing now (spoiled as he is), and isn’t about to give it up.
He loves whom he loves, and it’s just the way he is.
He adores my mother. Few things are funnier than an 87 pound Mali losing his mind when you ask about Grandma.
I love working dogs of any breed, but you really have to “learn” them, and they need a “job”. Or they’re a mess. LOL.