Yes I too have trained up a dog or two to be around chickens(some take
STERN DISSUAISION that a lot of folk would consider cruel but....) and a couple I have now are very good guardians and will even watchout for hawks and even run them off if need be. They are now protectors over the flock they were chicken killers too as young pups/adolescents, I had to work with them. But I guarontee ya if you take a Momma hen and sick her on such an untrained dog or one that is a for sure killer/already in the habit of doing so "THAT hen is not going to stand snowball's chance in HELL" against a mad/mean animal with a mouthfull of teeth.(come on now) get real folks, common sense(laws of nature) is a very good
tool to use most of the time.
In other words don't try to let a little hen try and whip off a big ol hound with the intent to kill/eat it. The results will more than likely be unsatisfactory and much less won't be funny to watch. Well for most people it wouldn't be.