That particular dog is from a local place that has several generations on site. As near as I can tell, they are all cattle dogs (mouth corners and all are in line with that being the case), with no bully breeds or anything being bred in. The trend is just going toward breeding blockier (ie. have you seen traditional Am pitbulls next to the over muscled ones? Not mixes, but bred to be big and blocky. A bit different as that is not a show trend as far as I know). They are AKC registered, though obviously that can be falsified, but the trend towards blocky is something I haven't been able to escape in general. X(
Oh wait! I thought you meant these:
http://cdn.backyardchickens.com/0/0b/0b3ddd28_gallery1.jpeg
http://cdn.backyardchickens.com/7/76/760fce7c_gallery1.jpeg
You meant this one?
http://cdn.backyardchickens.com/4/4c/4c3d42fc_132.jpeg I'll have to look back as to where that one came from. I want to say that one was from a breeder website who is involved in showing, but will have to check.
In case I did not post it, a fairly well established conformation breeder went from:
http://cdn.backyardchickens.com/9/92/9254733c_OR_sm.jpeg
To:
http://cdn.backyardchickens.com/e/ea/ea5d2de3_nasasidet.gif
I love the first dog...you couldn't pay me enough to buy the second. Went from streamline to blocky and lost the intelligent ACD eyes I just love. Just my personal opinion.