I don't know how comparable rabbits and dogs are... but one of my boy bunnies had recurring cystitis (though never saw any blood in his urine) and eventually neither antibiotics, nor homeopathic remedies (which worked to start off with) or anything else worked. My vet then suggested to give him a vitamin C supplement to acidify his urine (something which is apparently done with dogs and cats too) - and bingo, he never had cystitis again! So hopefully it's just something simple with Jakey.
Vera
I had the same thing happen with a male cocker I had years ago. You could see blood in his urine, but the urine tests didn't show any blood cells!
After a couple of rounds of antibiotics, the blood would just come back a few days after stopping; the Vet said to give him Vitamin C (500mg, per day) Cleared him right up and the blood would only come back if I didn't give him the Vit. C for a couple of days
It certainly does no harm and won't interfere with any other meds they may be on
Best of luck tomorrow
