A little less than half a teaspoon I think. Do you have one of those sets of measuring cups that's used for baking? You might get a more accurate measurement with that. I'm always worried that I overdose, especially on such small animals.
Thanks. I just wanted to make sure I was doing my math right. It's for Critical Care (it's milled and mixed with water) so does not have to be super accurate and he's actually about 428. I do have a good measuring set of spoons that I use so I'll get close enough.