Male or Female Dog?
I vote male. I've had two of each, currently 1 male and 1 female, and in my experience the females seem to be more independent and do what they want, when they want. It's not a huge deal, just a preference of mine.
Scamp360, in response to your question about american bulldogs, my male is 1/2 american bulldog and 1/2 black mouth cur. His mother was a pure bred american bulldog, all white, and she was very gentle when we met her. My dog, Tugger, is very gentle with children who pulls on his ears, the other female pup, who constantly pulls and tugs on his jowls, the cat and pretty much anything else that he comes across. However, he is VERY protective of the property and of the family when strangers or strange dogs come around. He is not a biter, never bit anyone, but there is not a doubt in my mind that he would know when the proper time to do so would be. He is not extremely tall, because of the bulldog in him, but he's solid as can be, between 90-95 lbs., extremely strong with a bark that'll rattle the dishes in the kitchen. So, for that he is a good watch dog. (good for keeping jehova's witnessess off the property) He is never tied up, we have 15 acres between my parents, grandma, and myself, and he roams the property while I'm at work, and loves to ride in the back of the truck. So, in short, I'd say yes to an american bulldog. Here's a couple of pictures of him. In relation, I'm 6'3 240 lbs.