Thanks for the comments everyone.

I just wanted to let you know that I haven't really captured his serious deep bark yet. It is really something and at first I thought it sounded quite a bit like Bon, the mastiff. I was shocked that he had a bark like that.

Yes, my neighbor has one dog that can really bark. My neighbor does rescue work and she has a ton of dogs. Too many for where we live. Just ask Anna and Kay. I'm not for sure if Amy got to see them when she was here. They bark all the time! Thank God they are only in and out a few times a day right now. Summers can be bad because they are out more. I figure my dog barking once in awhile is not going to disturb the neighbors too much more. Besides I'm pretty good about bring Zack in if he gets too barky. He is sooooo good. Sometimes I can't see him if he is in two certain corners of the yard and all I have to do is "Zack, come" and he is right there at my feet. Wish Katie would learn that...lol. She will come but just stand there and stare at me in the pouring rain. Which she did today...lol