Sorry, I forgot to mention this yesterday, but I have heard that if you buy fresh parsley from the grocery store and chop up about a teaspoon to sprinkle in with his food, that it will help tremendously. That's what I was told by a friend. I haven't personally tried it, so I can't give you a first-hand testimony, but she swore it worked wonders.
Yep, ACV - apple cider vinegar. The stuff you get from the grocery store doesn't have the healthful properties, though. I get mine from a health food store. The brand name is Bragg. It's raw, unfiltered, organic ACV. It's cloudy because it has "the mother" in it and that's what you get the benefits from.
Its all fun and games until the flying monkeys attack