that's how we found out was a vet and bloodwork, the vet said she was super healthy so we aren't gonna euthanize her yet, but if they do surgery it's a low chance it's gonna be removable and non-cancerous. it's also likely that it's not growing off her spleen, and if it's not then they won't wake her up. we are just gonna keep her alive because she still acts just like a puppy, and she's still her happy, silly self.