I have a pair of boots that reside on my back porch. I step right into them as I exit the house, do my chicken work, step out of them and step in the door. The chicken pen is maybe 80' from the porch, so I'm walking thru grass both ways. I have flies. Not around the chickens, but in the house. I don't think they're coming from my porch/boots, but DH thinks they are. Any suggestions on fly control? (This is really tongue-in-cheek--he thinks I don't know it, but he lets 2 out every day and they hang around the house and he feeds them crackers--it's his fault, but nothing I say changed that! He lures them back into the pen before I get home--my granddaughter told on him)