Hmmm...thats a good question...it took quite a while for Kyra to learn to speak but she learned from Micki.

How about trying to get him to bark out of frustration? Put a gate up or tie him up so he can't get to you and talk excitedly to him until he gets frustrated because he can't get to you and bark, this may or may not work. My friend has also been working for years to get her dog to speak on command and has not yet succeded, it is much easier to teach a dog that barks a lot. Good luck!