I need help from the vet figuring out what’s wrong the my dog. He is 14.5 years old, had a dry eye condition for about a year, which improved after a graft surgery 2 months ago. About 10 days ago he got sick, stopped eating, very weak, throwing up, little to no bowel movement, dark urine, leaking urine at night, very low appetite, very little eating, drinking lots of water. Did X-rays, blood test and urine tests, found nothing majorly wrong. Took antibiotics, urine turned yellow for a few days. Stopped anti bionics for one day, urine is back to dark, bloody color. What’s going on?