One of the best things about small residential flocks of chickens is that they tend to be exceptionally healthy. Many of the chicken diseases that affect larger commercial flocks are just not a big deal for small backyard homesteaders. However, there are a few chicken diseases you should be aware of, just in case. Some of them are signs of problems with your management practices. Some of them are not preventable at all, but can be treated. Others indicate that you’d be better off starting over with new, healthier birds.