low protein for urinary issues isn't a choice I've really ever heard about before... care to elaborate as to why he's recommended this route? You've peaked my interest!
There are options for you, don't worry about that! Senior foods are going to have a lower protein level. Off the top of my head, I'm pretty sure Innova Senior is 18%.
Edit: Brattina posted while I was typing! LOL Good to know we both had the same thought with Innova though.