Roscoe update.
His bloodwork came back age appropriate for kidney function. Heart is good. The vet is perplexed why he is consuming so much water. For now monitor and report back in a month for chest and abdomen x ray if condition remains the same. Sooner if it worsens. So far it sounds like we limit his water to about 24 ounces/day and we've dodged a bullet for now. He's 14 and I'm grateful for every day.