i probably told this story here before.
but my wife's father had a farm. and our kids, while visiting, said "boy, we should get chickens too!!!!"
seeing i have a barn, i closed off one section to make a chicken coop, nice place at night to lock them up, and a small area outside with chicken wire they can root around in during the day. It was their job to take care of the chickens....to make sure if they were out of the pen, to shoo them back in before nighttime, and feed/water them.
Our golden retriever carefully watched every minute of all this. And things went fine for about a month.
then one morning, my neighbor across the street calls up "Uh, there are some dead chickens on my driveway". i go over, and indeed, a couple dead chickens. i bagged them. he was taumatized. then i go back to the barn....notice a dead chicken here, another one there. out of about a dozen chickens, i could only find 2, and they were way up in the barn rafters afraid to come down. and sure enough, in prances our golden retriever showing off how she finally got all of those nasty birds for us! The dog was so proud. the kids had forgotten to lock the chickens up for the night, so they were out and about when we let the dog out to do her business.
that was the last time we tried to grow ANYTHING more mobile than some tomato plants.