Hi all! (Sorry for the long post)

I am hoping that someone else may have experienced this and can provide some guidance. My eldest pig (6 years old), Bear, has been presenting with blood around her vulva for the last month or so. The first time we noticed it, we took her to the vet and she was diagnosed with a UTI. The vet ran a urinalysis on the urine Bear left on the examination table and it had blood and leukocytes in it. So they prescribed her Baytril and told us to call if the blood came back after the 10 days of medication. There was no blood while we were giving her medication. The day after her last dose, the blood showed back up. We took her into another cavy savy vet and he said that it probably wasn't a UTI. He took x-rays, but couldn't see any stones in her bladder or kidneys just a little bit of air in her intestines. So he prescribed meloxicam and metoclopramide (Reglan) to help with the gut motility. The vet also said that she exhibited a little pain when he pushed on her stomach near her genital area. We took her back into to this vet after she was on the medication for 10 days. The vet was happy with her examination and we hadn't see anymore blood. We have been checking her daily and there hasn't been anymore blood until this morning. Bear is eating hay and pellets and drinking water like normal. Her feces are normal in size and color. She isn't lethargic and it doesn't seem to be bothering her. Has anyone else experienced this? The one vet has said the next step is to spay her but at her age I don't like the odds. Any advice you can give would be greatly appreciated! Thanks!