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Hi Justina and Happy holidays.
I am sorry Otis has this trouble.
He could have a UTI or interstitial cystitis:
Many times this is caused by a dry food diet. Please read articles written by a feline vet:
You can give him 4 drops of cranberry juice (by dropper) every day for ten days. It will lower the PH of his urine.The blood should also stop as the irritation heals.
If he had an antibiotic injection it was probably convenia. Clavamox or clindamycin twice a day for ten days may be a better choice if the blood continues.
Please let me know how Otis is doing.
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