Our bunny Carlos is only 14 months and seems healthy and happy. He eats his hay, runs and jumps etc. Yesterday we looked at him and there was a huge dark mass on his side. I don’t know how we could have missed it before because we pick him up at least twice a day. We took him to the emergency vet and they cleaned and clipped but I will be going to a regular vet Monday. Has anyone seen something like this before?