Great photo Snorri. You are right about working collies...when I got Fly (her fifth home by the age of three) she had never been in a house, never had children to deal with, was inadequately socialised (shed bred puppy by triallist)and was extremely nervous of most things.
My youngest was not quite three and pretty good with animals but likes to control them to the point of snapping on leads etc..At no point did Fly ever growl or snap at her. She will never be a family pet as she doesn't play with toys etc...but she comes in the house happily enough, eats indoors, rests in the day indoors, and I work her on my sheep. Without that I'm not sure what safe outlet she would have found for her mind.
I am trying agility with her on a friend's fullsize course - she will do a few jumps and the dog walk pretty well...but only because the five-bar gate back to the car up the track is the far side of the last jump!
OP, this is an extreme case - I had an entire background for this dog and I got her to work my sheep