Answer: There are lotsa reasons I don't answer or respond to ya, most of the time, I gots no Idear what you're saying. I don't speak the same language ya do, and ya don't speak mine (which includes lots of body language), so naturally there is a language barrier. You've only taught me certain words like sit, shake, down, outside, so when ya say "get outta the trash" I have no idea what that means. I know friends who were never taught the simple word "come" before, they get in lots of trouble for not listening, but no one ever told them what it entails.
We dogs can be quite a lot smarter than ya think we are too; just like some human children we aren't going to do something if we don't think it will benefit us in some way. You wouldn't work for free would ya?
If I said your name in an angry tone (not that I can) ya probably wouldn't listen to me, who wants to confront someone who is mad at them for unknown reasons. I may not always understand your words, but your tone of voice usually says it all.
Finally, I hang out around you ona daily basis, and sometimes you're on tha phone, watchin' TV or talking to the family. Guess I accidentally learnt that ya aren't always talkin' to me.
We're all just a bunch of dogs who just like humans have different personalities. There isn't always a 100% correct answer.