My rat wags it's tail? Has anyone else's rat ever done this?

Ignore erin. She sounds like a horrible person. Rats are fantastic animals and so affectionate. They say that it is a sign of stress but also can it can be a sign of content. My 2 girls-olive and daisy-both do this, mainly when they're being stroked so I don't think you have anything to worry about. Maybe observe how they move their tails when being petted etc to when they seem stressed or aggrevated and compare the movements. They sound lovely. Good luck x