I've had plenty of dreams featuring talking/anthropomorphic animals, but it was only a couple years ago that I had a dream about actual furries, I.E. people in the furry fandom. Or rather, a cult of insane fursuiters.
I dreamed that this group of about a dozen or so fursuiters appeared in my backyard, and asked if I wanted to join them and "become a tiger". I told them I already had a fursona, but they ignored me, grabbed me, and the next thing I know I was in this old abandoned parking garage. All over the walls were newspaper clippings featuring photos of the fursuiters performing horrible acts like burning buildings and kidnapping people. They reappeared from a corner and told me that they wanted to "show the world the truth", and brought out a syringe full of green liquid and tried to stick me with it. Though I didn't see it, I knew that these fursuiters weren't normal humans underneath their costumes, but mutated humans whose bodies were twisted and grown into horrible facsimiles of their suits (like, imagine taking a human head and carelessly stretching it into the shape of a dog's head). They let me go when I asked if I could go to the bathroom first, and I ran as fast as I could down a hallway. I woke up after finding an actual bathroom and trying to find something to use as a weapon.