I posted about this earlier in the other thread, mostly that the video should be used in dog safety lessons. A dog doesn't have to be snarling to be warning you.
However, about Barney himself, I don't hold this or the other bites against him, really. I doubt any of the "bites' were more than a nip or a snap, or he would have been sent back to Texas until Bush left office or adopted to a staffer.
THe problem with poor Barney is that he has a very hard job that he clearly doesn't want. The First Dog, like the President himself, is a public figure. The FD lives in the White House, where there are all sorts of strange, often mildly treatening, alpha personalities comming through at all hours, where tensions are running high, and where almost no one knows anything about dogs, but assumes a canine celibrity, like the FD is a friendly dog. (in the whole video the reporter doesn't ask, but I'm sure he assumes that the FD is friendly . . . ). Some FDs clearly thrive, and others tolerate it quite well, I wouldn't say that FD is a bad job for a dog or that the White House is no place for one. But its not a good place for Barney.
Frankly, when I think of the social butterflies of the dog world, Scotties do not come to mind. They have a reputation, on top of not being wildly friendly to strangers, of being a little snappy with strangers. They are small, and thus people loom over them. Its a poor breed choice for that situation, and Barney seems to be tempermentally ill suited over and above that.
Good FD's need to be very stable, highly social, laid back, and preferably, medium-sized or larger. Barney is none of these things, but it doesn't make him a bad dog, just one who is not suited to his role and moreover, is being handled by a moron (that leash!).
This is why I hope the Obamas not only get a rescue or shelter animal, but that they do not actually get a puppy . . . they need an animal that is at least 6 months old, so that someone can do a real evaluation of its personality . . . older than that would even be better. But, the kids want a puppy, and I understand that too.