I own 2 chihuahuas, sort of by accident. I had a mixed chi and long story short, he got lost. In the process of trying to find him, we adopted two more. Yes, it's easy to avoid training them. One of them will nip at the heels of any man who enters the house or yard. So far, no injuries. The other is okay, though. Had I known, we would have trained them to never bark when someone enters the house--although I'm not sure this is possible without a Dog Whisperer to help!