Trying to teach Jack "speak"...

I am sitting on my computer watching Jack get frustrated with Serena chewing on a bone that he wants.  He has been uttering little barks so I ran and got treats and now I am sitting here pretending to ignore him going "yes Jack speak"every time he gets sassy with Serena and barks.  Cross fingers this works.  So far he has almost figured out that any noise he makes gets a treat...