I have always had a dog in my life. Currently, I have two medim Schnauzers that I inherited from an ex-girlfriend. Not really the type of dog I would have purchased on my own, but I must admit that I really do love the two. It took a while to get them both to their current state of temperment. They love most kids. They are my alarm system, but they are not yappy.
One thing to remember is that most dogs will become a member of your family. What I'm saying here is that if your family includes members that are hyper, loud, and just overall high strung, than the dog will most likely adapt and be the same way. My sister got a puppy from one of my Shnauzer litters. She had three boys under the age of 8. Loud and rambunctious. Now the dog is too! Completely different temperment from his parents but still a pretty good dog.
Dogs are like children that never grow up and move out!
When my two current dogs pass on, I think I will go dogless for a time just to see what it is like.