A dog got a couple of my chickens. There were no external injuries. After a day or so, one of them can't stand up. She eats and drinks, but her legs just stick straight out. The other one's foot is curled up and her walking is getting worse. Today, one that didn't get hurt by the dog is having trouble walking. I can't afford a vet. Is this all connected and not an injury problem? Worms or some disease? They're comets (cinnamon browns), about 3 months old. They eat laying mash with the old chickens.