[OwnedByJezebel]

Dogs do identify specific people and other dogs by their smell, and don't really rely so much on eyesight.

In one of Cesar Milan's training books, he mentioned that every morning he took his "pack" on a long exercise in the hills. They would run, walk, and occasionally stop to rest. When they were moving, they were moving as a pack, all mixed up but moving together in unison. When he would stop to let them rest, they were separate from each other according to breed. The pit bulls would all go sit together, the GSD's would go off and sit together, the Rotties, etc. I have to believe they know "their kind" somehow, and it is probably something that they smell.