3 words
Jack Russell Terrier
http://www.youtube.com/watch?v=eG9jY6_KKWI&feature=related
http://www.youtube.com/watch?v=6QPbZJT1NO0&feature=related
http://www.youtube.com/watch?v=WTxBnFwQWks&feature=related
I have 3 Rat Terriers and a Jack Russell/Rat Terrier cross. Before I had the Rat Terriers, my wife had a Jack Russell terrier as her falconry dog. He died suddenly one afternoon after eating a poisoned roof rat that entered my yard from a neighbor's yard. It's poison OR JRT/Rat Terriers. You can't do both. Your pet will die in the process.