Hi all~ My male cat Bart sprays sometimes on this one wall, I noticed it was darker than usual. Then I caught him on the 10th of January, and there was blood in it. I took him to the vet, and she put him on an antibiotic. He still has blood today, after 6 days, of course sometimes I think he swallows the pill, but I find it laying somewhere, then give it to him again. I'm just thinking after 6 days (the antibiotic is for 10) he should be better???? Any thoughts are appreciated. Thanks!