[Nancy1999]

I've never heard that spaying calms down females, neutering sometimes calms down males because the testicles produce the bulk of testosterone, and as you probably know, testosterone is associated with aggression.

Yorkies seem to bark at bigger dogs, and I guess it's to show them they are not afraid. I use "redirection" with Joey. If we come upon a bigger dog, I just give a quick pull to his harness and redirect his attention, I do this several times, but he wears a harness not a collar so this will cause no injury. Sometimes, we have ended up in the opposite direction, and then I turn him back to the correct direction. I gave him a quick "Uh-uh", when I do this. I also try to keep the walk fairly fast paced so that he feels like this is his job. He has gotten much better using this technique. I'm surprised you haven't seen walking on Cesar's show, it seems like proper walking is a big part of every dog's treatment. Your job, as some have suggested, is to think ahead, and be on the lookout for trouble before it starts, keep your walk very purposeful, even though he's barking.