This morning, my chickens were safe in their coop when a neighbor dog came running at the fence. He couldn't hurt them, but he scared them and they ran around flapping their wings in their run. I ran the dog off and when I checked on them, three out of my four chickens had little bloody scabs just beneath their combs. They weren't there before! I think it was were they were flapping around and running. But I don't want their scabs to get infected. Is there anything I can put on them to keep that from happening? Please help!!!!!