I've seen this question on many forums and heard breeders discuss the fact that their bunny has changed gender. In fact, rabbits who won awards at ARBA congresses were shown later to discover that it was actually a dollar. Does this mean that a rabbit has changed sex?
Surprisingly in nature, there are cases where an animal can change sex. Take for example a clown fish. Clown fish live in schools. In this school is a leadership structure led by a female clownfish. When this clownfish dies, it is the most senior man in power who takes over and changes sex, especially with regard to reproductive functions. This is however a rarity for this type of biological change. In fact, there are even rarer cases of humans having sex changes due to a deficiency of 5-alpha-reductase (5alpha-RD-2) or a deficiency of 17 -beta-hydroxysteroid dehydrogenase (17beta-HSD-3).  Bunnies are not part of this strange and rare category of animals that change sex. A rabbit born of a dollar will be a dollar at 6 months, a dollar at a year. A rabbit born as a doe will be a female and a six-month-old doe every year
At a young age, it can sometimes be difficult for experienced breeders and even more difficult for inexperienced breeders to sex a rabbit. The majority of "sex changed" rabbits are actually the result of a bad sexing of the rabbit by the breeder. We have rarely made this mistake. You can usually trust a breeder who has been raising for several years.
There are other factors that can contribute to a poorly sexed rabbit. A male with a divided penis will often be sexed like a doe. The use of unreliable techniques to determine the sex of a rabbit will often result in errors. We will soon have an article on the correct sexing of a rabbit.
The essential thing is that it is genetically impossible for a rabbit to change sex. The next time you hear this, remember, it's a rabbit that has not been properly sexed.