MOB's story above reminds me...
5 years or so ago my wife and I went to visit my oldest son in Tennessee. My son has a very large fenced in backyard and he was keeping chickens back there. I think that he had around 12 chickens. We had our 3 small dogs with us and they had never seen chickens before. My son wanted to see how our dogs would react to the chickens and he wanted me to turn them loose in the backyard and see what happened.
I suggested that we turn the dogs loose one at a time instead. My son has two large dogs and they never bothered the chickens and the chickens were used to the dogs.
Bosco, our mini Dachshund, was first. I thought for sure that she would go after the chickens but all she did was walk over to them and gave 'em a sniff, that was it.
Agnes, half Dachshund half Yorky, was next. She charged the chickens at top speed but when the chickens didn't run or show any fear she lost interest.
Sookie, Agnes' sister, was last. Sookie took one look at the chickens and made a bee line for the largest chicken. She grabbed that chicken by the neck and shook it for all she was worth. The chicken was screaming and feathers were flying everywhere. Sookie was having a BIG time! My son yelled out, "oh no, my chickens!" and ran to his chicken's rescue. I was laughing but ran along and pulled Sookie off of his chicken. The chicken was ok but we had to keep Sookie away from them after that.