I'm not sure how old he is. He was an adult when I got him 3 or 4 years ago. He's had blood work twice. Once before his neuter, and once about a year and a half ago.
He eats tons of hay. Grass, oat and timothy. He gets a large salad every morning and a tiny bit of oxbow timothy pellets at night.
I guess it is the weight loss and the fact that he has been a little quieter that has me thinking kidneys. I am used to cats and dogs, and that seems to be one of the main symptoms with them.