My coyote worked well, but just had a mated pair with five little babies wander into the pond. My wife and I tried everything to get them off the water, but they would not leave. My dog was doing laps back and forth chasing them while I threw rocks to no avail. We did this for an hour. We finally gave up. I think we convinced them that it was a bad place to raise a family. They have not been back (two days).
