My 14 month Beagle/Boxer is random. She will bark at the vacuum and growl REALLY MEAN and when she gets super-excited (like when we start to play with her) she will throw a hound-like howl in there (even if a toy is in her mouth). She used to bark when people came to the door (which I liked) but she doesn't any more. She would even do it if there was a weird noise. The first time she did it was when the leasing office was sliding letters through the door and she dove off the couch, ran to the door and barked and growled in like a fight stance. I LOVE THAT! But she stopped doing it. I would like to #1 - get her to speak on command and #2 - get her to bark when someone comes to the door until I say it is okay. Every time she barks I promptly say "good girl, speak!!!!" Two times I have gotten her to speak on command but they were directly after she did it herself. I just can't get her to bark at anything else. Any advice?