Does sausage have rat hair in it?

No, the claim that sausage contains rat hair is a persistent urban legend. While it is true that some meat processing plants have been found to have unsanitary conditions, there is no evidence to suggest that rat hair is intentionally added to sausage or any other meat product. The USDA Food Safety and Inspection Service (FSIS) regularly inspects meat processing plants to ensure that they meet USDA standards for sanitation and cleanliness.