It started with just my dominique hen having some poop stuck to her bum and occasionally straining but otherwise acting fine. This morning we noticed the rooster also has runny poop stuck on his bum. Both are 8 months old. Wash their bums, check for Fly Strike, then what? Other than kind of straining to poop they seem perfectly fine. I feed Nutrena layer feed, free range, and kitchen scraps a couple times a week. Do I need to worm the whole flock? Probiotics? Try it all?