pepperment oil works well, put some on cotton balls, or put the cotton balls inside the wirey pads,that way they won't blow away. However, you have to stay up on keeping the oil current. I've planted peppermint around the coop, but also have the electronic traps that zap. They're a little pricy, about 24 dollars each, but two or three will take care of them all. Just put a little bit of peanut butter in, turn it on (batteries last for about 50 rats/more for mice) and it kills the parents first, so no sweat, plus you don't have to look at the bodies, just carry the metal domed tent out and dump it out. I HATE the gummed ones, slow torture. I've had them stick to the inside of the trash can, on the butt of my puppy who didn't know what was happening, and backed up into the gauzed drapes. Lots of fun trying to unglue those. Rats are very smart and will MOVE poison pellets, including where other pets are. Won't use them.