So domestication is an on/off switch? It's not a gradated spectrum like everything else in biology?
Wouldn't you agree some domesticated animals are more domesticated than others? Some farm animals have higher levels of comfort with humans around than others... etc.
Some dog breeds are definitely more domesticated than others.
It's not an on/off switch or a spectrum. It is a modification of many things.
For instance, the prey drive.
In a wolf, the prey drive goes: watch, stalk, chase, grab, kill.
All dogs have some sort of modification of this, many times missing certain steps.
A pointer might have watch and then it's done.
A border collie would be watch, stalk, chase.
A pit bull has been bred to go watch, chase, grab. This obviously makes them more dangerous than a pointer or a border collie, but you can't equate it to that of a wolf.
There is no "more or less" domesticated. Domestication simply means modifying the behavior of an animal (or plant) so that it generates traits which are beneficial to humans. The pointer for hunting, the border collie for herding, and the pit bull for taking down bulls (holding on). They were originally bred as a catch dog (look up catch dog if you want).
By the way, this is why people thought Pit Bulls had "lockjaw", which is a myth. They don't have lockjaw. They simply bite once and then hold on, because they were bred to get to the "grab" stage and stop, not moving to the "kill" stage.
So when you get a dog, know which traits it has been domesticated for. All dogs should have the proper outlet for their prey drive. For instance, my German Shepherd, which has a similar drive as a pit bull (watch, stalk, chase, grab), I funneled at a very early age into chasing a ball. He's never once shown aggression towards humans because I knew what I was doing. He barks at loud noises but is friendly to everyone (which works out perfectly as he'd bark at anyone trying to break in, but I can have anyone over with no incident). He has an EXTREMELY high prey drive (the longest I've clocked him in at chasing the ball is 5 hours non stop, then I got tired of throwing
😛), which if it hadn't been channeled could have been a problem.