What does she do with the squirrels after she catches 'em?
A terrier will grab the animal by the spine and give it a fast, violent shake, then throw it away and start looking for the next.
Billy, a very famous dog of his time, was matched to kill 100 rats against, The Kentish Bitch, which was almost equally famous. On this particular occasion the official rat-catchers for the pit had failed to provide the requisite 200 adult rats so that the match had to be declared "No-Go". The result with the rats available was that Billy disposed of 90 in 7 ½ minutes and The Kentish Bitch killed 65 in 8 minutes 45 seconds. Which was a pretty good performance.