Here we go again. Whitey couldn't stay out of the litterbox yesterday, and off we went to the vet to have his urinary tract examined. (I don't blame him for not enjoying this project. A catheter was involved.) They found some signs of an infection, and prescribed amoxicillin. More worrisome, though, they found a pretty high concentration of crystals in his urine. That's potentially life threatening in male cats, since the urethra takes a fairly convoluted path and is easily blocked. EEK!
He's off to the vet again this morning for an ultrasound to see if there are any large stones. Meanwhile, we're switching both boys over to prescription food for feline lower urinary tract disease: lower minerals, plus it's supposed to change the bladder pH to minimize crystal formation.