There are no dumb questions . I'd say definitely yes, an older dog can easily be taught new tricks. I think it's harder to break a habit in an older dog, but not really to teach a new trick
Exactly! Kaedyn was so easy to teach commands to. It was just as easy as it was teaching Kai as a pup. But breaking the habbit of barking at every moving thing will be tough.

Don't worry, that wasn't a dumb question at all.