My 10 year old corgi is doing great with my five free ranging 4 month olds. She was introduced to them when they were 1 day old and has never shown any aggression towards them. She waits politely when they are eating their yogurt or bread treats and then cleans up any crumbs they leave. But, if I may say so myself, she is a smart, well-trained dog and knows that the chickens are part of the family.