Spayed female making noises

Question
Hi Pam
  I have a spayed Holland lop, Bella, who is bonded to a neutered lop. They live indoors, used a litter box and their diet is tomothy hay, pellets and the daily treat of romaine, piece of apple or banana and rolled oats. Lately Bella has started to make a noise much like a guinea pig would.  At first we heard it when it looked like she was napping and we thought she was snoring. But now she seems to make the noise throughout the day, sleeping or not, but at other times she is quiet. I took her to the rabbit vet our local HOuse Rabbit Society uses.  She did not have a temperature, no runny eyes or nose and seemed quite healthy although a bit chubby.They put her on Baytril to see if that makes a difference and because they felt they should do something. I did not go for xrays since there were was no fever or other signs of infection and because she eats well and is healthy and active.
She has been on it for four days now and we do not hear her making the noise as much but it is not totally gone.  They said that it could be a URI but from what I read she does not have any of the symptons.  Could this just be a mating type noise I have read about?  Do you have any other ideas?  

Also what is the best thing to give a rabbit to keep their teeth in good shape?

Thank you.

Answer
Hi Vicki,

I have never heard a spayed rabbit make any mating noises.  I have heard aggressive rabbits make a grunting noise when you reach into their cage but they normally don't do it unless they feel threatened.  I would suspect that she does have a URI even without showing symptoms.  Sometimes their membranes can become swollen and they will make bizarre noises when they breathe.  If the antibiotics are helping to make the noise go away there is a good chance this is what you are looking at.  Without actually hearing the noise I really can't say but in all honesty unless she has a reason to be protective of her area and this is a new thing all things lead to a respiratory issue.  Luckily you have found a good rabbit savvy vet to help you.

I wish I had a better answer for you.

Pam