My dogs go after almost anything that comes into yard. With most types of predators the dogs had to actually meet predator before first dog got its head in the game. He also learned quickly to listen to birds and respond to their calls. I have strong suspicion dogs get more out of chickens than simply a general alarm based on how dogs react.. First dog greatly sped training of second. This evening I did a search on youtube.com for examples predators going after chickens. When the videos played with chicken alarm calls the dogs go bonkers. A little work and think such could used to train green dogs not already experienced with bad guys.