Also, I know cats are awesome mousers, but be sure that you don't introduce an unfamiliar cat, especially a barn cat, unless you are prepared for the possibility of losing a chicken. My cat is not an issue, she's not hungry for chicken dinner. She is more than welcome to hunt mice, and does. I am lucky to have my dog however, because we live in a town with a TERRIBLE cat problem (most days you see 20-30 cats sitting in front of a local business that feeds them). Stray cats are always after my chickens, especially when I have chicks. My dog believes that her chickens are her pack; she defends them fiercely. More than once she has killed a stray cat attempting to get to "her" babies.