I have 3 barred rock chicks that are 4 weeks old I bought from a local organic chicken farm and 6 others from tractor supply. The barred rocks are currently seperate except for a small amount of time they spent in an enclosed space with the others on a warm day. I have fostered many dogs and the older chicks seem to have some runny poos and smells foul like coccidia that happens in shelter dogs. Otherwise they appear healthy. I feel I need to treat them all. What is the best course of treatment for them?. Their brooders are completely cleaned out daily. They are on non medicated chick starter at the moment. The bigger chicks are in the garage in a large dog crate. The younger ones inside in a big bin with a heat lamp.