QuestionWhy is my 4 month old mini rex bunnie sneezing? And why is she growling at me?
AnswerAs for the sneezing, does she have any nasal discharge? Are the insides of her front feet all matted? If so, you would need a rabbit-knowledgeable vet to check her out to see what is causing the sneezing.
As for the growling, she may be approaching bunny sexual maturity. You can read about spaying and neutering at http://www.rabbit.org/faq/sections/spay-neuter.html
Having been around unaltered rabbits, I can say there isn't enough money to keep me from fixing them. Male rabbits especially have a number of very undesirable behaviors (spraying, mounting, more spraying...).
Kim