And to add to my comment, I don't even think dogs needs to do the nose to nose hello on walks that so many people want to do with their dogs.
Some guy came up to while I was walking my dogs the other day. He's got his standard poodle type dog on a flexi leash. Asks if his dog can say hello. I, in the nicest way possible, say no thanks. He gives me a weird look and says "oh, so you want your dogs to be mean". I just brush it off and keep it moving.
This is the common way of thinking. I just don't get why everyone thinks that every dog needs to meet each other. I don't walk up to everyone I see walking down the street and shake their hands and introduce myself. Why are dogs any different?