So, I have had chickens for about a year. My neighbor caddy corner to me recently got chickens. I heard a rooster start to crow over there about a month ago. No big deal, at least it is not MY rooster. Well, he is a good sized Buff Orpington rooster with 8 (at least) gals of his own, but he has recently started to come to my yard to visit. It doesn't bother me too much, but I wonder about illnesses, and I worry he will be hit crossing the road (I guess I know why the chicken crossed the road...). I have spoken with the neighbor, but he can't seem to find how the sneaky brat is getting out - during the week they are penned & only range during the day when they are around. He's over here now, foraging with the girls... maybe he thinks that they are part of his flock & is trying to bring them back over there? Are there any ways I can protect my flock from illness / know his flock is disease free? I really don't mind him coming to visit, as long as he is not carrying something that will infect my girls. Or, is it likely, since we live so close, that many illnesses would already be things they are exposed to?