we have plenty of them here in SC but there not just in the swamps. i bow hunt in the swamps around here for deer and hogs and that starts up in August. you see plenty of them but rarely do they present any problems if you stay smart about it. as far as the dog goes, usually dogs will keep their distance but it's not that uncommon for them to get bit but with proper attention it isn't always fatal. i hear more about it happening while dove hunting in sept and october. i had a friend with a springer spaniel that took a direct hit on the nose from a rattler and still survived. we don't really get a lot of ducks around here and when we do it's usually late and most snakes are hibernating by then. you have to be more concerned with cottonmouths (water moccasins) because they are far more aggressive. it's not something to take lightly but you do get used to thier presence. what's bad is walking through thick underbrush while scouting or going to a tree stand where you can't see where your going...you think a lot about it then.