Our mini dachshund does the same thing with mice. Our detached garage is a mouse haven. My husband says, “ let’s go get a mouse!” And the dog flies out the door, runs in the garage, roots around til he finds a mouse, grabs it and breaks its neck, throws it down, and runs and finds another.
My house used to get mice every so often, but we’ve seen no evidence of them since adopting our dachshund three years ago. She cleans up the crickets, shakes them and drops them on the mat outside our kitchen. My fierce little girl is FAST.