So a little over a week ago my male cat started peeing everywhere outside the litterbox. My cat dakota was a stray when I found him. The vet estimates his age at around 4-5, he was not neutered when I found him but I got him neutered. After he started having trouble with his bladder I took him to the vet.

They did a urinalysis that showed he had crystals. So the vet prescribed pain meds for 4 days, and a urinary diet, the Royal Canin urinary so. He seemed to be doing much better. Now today he started peeing outside the litterbox again and this time he has blood in his urine? Why would this be.

You need to call your vet back and let him know about the bloody urine. The urinary tract is irritated and he is probably working on a nice little infection. His treatment may need to be tweeked and it sounds as if some antibiotics are in order. It may also be worth your while to discuss an x-ray to see if there are any stones in the bladder or urethra.