I can see the point with the border collies - My folks got a border collie pup about three weeks before I was born - so I was raised with her. She was an absolutly mint dog - never bit anyone or anything, really intelligent as well. As she got older, we got another border pup called Meg. She was a nightmare dog, we had her for about three months and she would bite, eat, chew, bite some more, chew some more - a lot worse than most puppies. We ended up taking her back to the farm and swapping her for another pup of the same litter, bodie, who was a cracking wee dog. (She died when she was six months old of a brain haemorrhage
).
That's what I mean when I say that it is down to the dog. And yes, I know they are all one species, but so are humans, and you certainly get pretty drastic differences between them - be it from person to person or from country to country.
I'm a bit confuddled as to what your point is in all this - I think it started with you saying that dogs arn't loyal or affectionate. I can't agree with that. I could agree with SOME dogs arn't loyal or affectionate. In as much the same way as SOME dogs are dangerous / violent. You can't tar them all with the same brush. The evolutionary process that got them to this point isn't really important in this discussion... in my opinion.
Ergo... dogs > cats.