Thanks for the encouragement! I may just be paranoid, like usual.

I looked on the Internet and here are the symptoms:
poor weight gain, sensitivity to sedatives (especially diazepam), depression, head pressing (pushing the head against a solid object), seizures, weakness, salivation, vomiting, poor appetite, increased drinking and urinating, balance problems and frequent urinary tract disease or early onset of bladder stones.
Hobbs only has one of those, being increased drinking and urinating. Maybe he just likes water?? His yearly checkup is a little while away, but when I take him in, I will definately discuss it with his vet. I'm just wondering if I need to take him in sooner??