While we were in the park today a small mouse ran out from under the bins. The West Highland Terrier we were with at the time was very excited, but Teasel didn't pay it any attention at all. And when I tried to flick it off my foot (photo) with the ball flinger she went for the flinger and ignored the mouse completely.
According to our book, the Miniature Schnauzer was "originally bred to hunt rats, then as a companion". Teasel seems to have chosen the companion option.