What is a dog man?

I know a coupple....to me it is not necessarily age or time in dogs but sometime it is. Some good dog men in one venue sometime suck in another venue,say all they have ever done is "X" venue w/ dogs but close minded to any onther venues and put them in a position to work dogs in another venue they will not excell. Some can do any thing w/ a dog in any venue and are constantly open to learning no matter how minor it may seem and always evaluating the dogs in there chosen venue and never stop trying to learn more. Some time the better dog men have the least to say as they are still listening and learning.To me that is close to a dog man.