Depends on the dog, I guess. Again I remind all that my wife and I volunteer at an animal shelter, and we see tons of chihuahuas (thanks, Hollywood!). Some can be pretty anxious (you would be, too, if I stuck you in the equivalent of doggie county jail), some have a big dog attitude in a little body. Granted, a shelter is not much of a control environment, but I&#x27;d say it&#x27;s 50&#x2F;50 on the &quot;shaky, nervous little dog&quot;&#x2F;&quot;6lb. dog thinks he&#x27;s a pit bull&quot; ratio. Some are what you&#x27;ve seen, others are as confident as any 120lb. Rottweiler, strutting down the street on their walk.<p>Without a proper control, I put it down to environment and how they&#x27;re treated. Many small dogs are &quot;purse dogs&quot; that are treated like accessories instead of dogs, and I hypothesize that has something to do with it. I mean, people get a small dog because it fits a certain lifestyle, and that lifestyle may not include treating your pet such that he gains confidence in all situations. But that&#x27;s just me talking out my butt, I have nothing that isn&#x27;t anecdote or SWAG to prove my point.