We have a Great Dane Pup (4.5) months old. We adopted him at 8 weeks, and he has been exposed to grown hens and baby chicks since his arrival at our home. He is excellent with them all. He likes to lick the fluffy babies. I have 3 month old chicks that don't always cooperate with coming in the coop at night, and the dog will herd them in, sometimes catching one softly in his mouth and bringing it inside the coop. The coop is also my pups first stop on his morning walk, he adores watching them file down their plank and greeting the girls each morning when i let them out. We got new chicks last week, and i had them sitting in a box on the table while i set up the temp brooder with water and food. I came into the family room to find the pup (he is BIG, 70 pounds and 26" at the shoulders) laying calmly on the couch with 2 chicks sitting on his butt. Wondering how they escaped from the box i stood out of sight and watched. Pup gently put his giant face in the box and extracted another, and placed it with the group he had on the couch. Then he put his nose against them and licked them, before falling asleep. I took some great pics that i will post when i have time to upload them. The key to mixing chickens and dogs is to get a breed that does not have a hard prey drive, and to give the dog access to the chickens early in its life, with intensive training. My dog loves his chicken friends and he appreciates a raw egg each morning too!