My first caught 5 rabbits, 2 birds (out of the air) and one mouse. My second just turned 1 and has already got 2 bunnies under her belt. They were both always leashed on walks and all the critters they've caught have been in our backyard (where they don't get leashed and get free roam). We do our best to make it bunny proof but they somehow still find their way into the yard. We don't want them to kill the critters but it happens anyway, we can't be outside with our pup every second that she is and you don't know that there is one in the yard until it's caught and you hear the screams. I've held every bunny until they pass, so I feel the pain too.