Cat peed in front of me and now constantly visiting litter
I'm a bit concerned. My 2.5 year old cat just peed in front of me. And now in the last 35 minutes, has gone to the litterbox about 5 or 6 times, and sits to urinate, but nothing comes out.
We haven't changed his diet, or litter. The litterbox is clean.
We have another cat (5 months old), since November, but the 2.5 year old has never displayed this behaviour before.
Not sure what to do, should I call the vet?
UPDATE: He's at the vet now. He's "boarding" there until he pees, so they can collect a urine sample.