Floppy Ear

Question
My bunny is an unknown breed and roughly 3-4 months old. About a week ago, one of her ears flopped down and stayed that way. I assumed she was some sort of lop since, but today both her ears are fully erect. I was curious why her ear did that. For the past couple of weeks it has been really hot, but since yesterday the weather has cooled down quite a bit. Is there a possibility it's due to the weather, or is she sick?

Answer
Dear Sophia,

I've had a bunny do this occasionally with no obvious reason. Sometimes a bunny can flop ears down because of an ear infection or mite infestation.  At the age of 3-4 months, your bunny might also be showing signs of expressing the lop mutation, but is only partly expressing it because she's a hybrid and may not fully express the trait.

For complete peace of mind, you might wish to have her checked by a rabbit-experienced veterinarian:

http://www.rabbit.org/vet

to make sure she doesn't have any problems with her ears.  But if she shows no further signs of ears drooping or irritation in the ears, it might have been a passing thing, possibly due to her genetic heritage.

Dana