I almost always post asking people to be nice, be neighborly and don't make trouble for yourself. HOWEVER. My sister once ran over me with her car while my father was mowing the lawn. My dog was barking at her. My dad asked what happen? did you hit the dog? My sister answered no...I ran over Kimberly. My dad said oh and went back to mowing. Two days later it hit him and he flipped out and grounded her for 2 months. Maybe your neighbor just didn't have time to take it all in. He was thinking "not my little dogs" and "I gotta mow" and was probably frustrated that the dogs were out of their yard and wouldn't come to him....I say now that he's had time to think about it present him with a bill for replacement. And those grown up chickens are worth way more than chicks. Many people here say they get $10 -$20 for a pullet. Bill him at least that. Be nice, but be fair to yourself too! Then politely mention to him next time will not end so pleasantly for him.