I just noticed that one of my hatched chickens has bright red blood in it's poop. What do I do? Chicks started with medicated feed Since moving into the chicken house they have been getting Dumor 20% [still because I can't find the 18%] They have been let into the 1 year olds pen and room when the older ones are ranging and sometimes I'm not quick enough to get the layer food up before they get into it. Not a daily occurance. They appear fine. Bright and perky, eating, drinking and watching me build more pens. These birds were not vaccinated as they were hatched here and I couldn't get out to get what I needed to do so. Never been a problem with them before.