You mean the 80 feet pen is the run, and the dog house is the coop?
Ducks can be messy because they belong in the water. If you give them bowls, they will get feed and mud in it immediately when they put their beak into it. It really helps if you have them on a natural water source. They NEED something to swim in, and most people do not like to deal with cleaning out the kiddie pool every day or so. They will make messes. Start out with a small number, like half a dozen or less. The brooding phase is the biggest pain because even with a gallon waterer, they need it cleaned out and filled a dozen times an hour. They can choke to death on their food without water, especially as a duckling. With ducks, you will need to frequently mulch the run because they will make it a mud slick, and then play around and drink in the mud. It is way easier to let them free range. It is better for their health, mostly because of their run turning to mud.