Why do rabbits spray out blood?

Maybe the rabbit is sick or it ate rotting food and it was in the stomach for a couple of days and it came out.It's best for you to feed it fresh water and food:-)change the food and water at least every other day:-)keep the cage clean and play with it in your yard.you HAVE to give it some time to enjoy the fresh air.

More likely she is dehydrated and she has a bladder infection, or it may be vaginal mucous from ovulation.