Worried about a bladder infection

Question
I have a two year old, non-spayed female dwarf rabbit who
has been acting quite different in the last 48 hours. I was
out of town for four days and a family member was
bunnysitting for me. I gave them a detailed list of her
needs and called every day to check up on her. I picked her
up yesterday afternoon and brought her home and she was a
little on the quiet side. This afternoon I was playing with
her and noticed some discolouration on her backside. I
picked her up and realized it looked a little like blood, I
checked her bedding to see if there was more in her cage and
didn't see any. I called my uncle to ask if he noticed
anything like that, he said no but did mention one of his
daughters has a friend with a male rabbit. Is it possible
the scent of the male rabbit made her become more sexually
receptive? I know that she doesn't go through heat because
rabbits are always ready to go but I figured maybe the scent
of a male rabbit might make her go through something similar
to heat.

I've seen her drink and nibble a bit at her food, she's
mainly been sitting quietly in one corner of her cage when
usually she is a fluffy white ball of energy.

To be safe I am taking her to my vet tomorrow. Maybe this is
the encouragement I need to have her spayed.  

Answer
Dear Eryn,

I sure hope no one got "cute" and introduced the male rabbit to your female.  If this is possible, then it is time to have her spayed NOW.  Please read:

www.rabbit.org/health/spay.html

If she is still not acting normal, please read this for instructions:

www.bio.miami.edu/hare/sickbun.html

And if there really is no chance she was with a male rabbit, then I would be far more worried about uterine cancer than a urinary tract infection.  Uterine adenocarcinoma is very common in unspayed females, so the sooner she is spayed, the better.  If she has a tumor that's hemorrhaging, then time is of the essence.

You can find a good rabbit vet here:

www.rabbit.org/vets

I hope she will be fine.

Dana