Doesn't Conrad look like Lincoln? They could be long-lost brothers! Conrad was was abused and neglected by humans, then spent a year in a shelter without being adopted because he was so fearful. So I offered him a job in my barn and he graciously accepted!
It took about 7 months (during which no one could get near him) but eventually Conrad learned to trust us. He is now very affectionate and cuddly!
I don't think Conrad is actually bringing down any rats, but his mere presence has been enough to reduce our population significantly.