Rylie burps up her water as well. She'll be running around outside, drink a huge gulp of water, run around some more, and then burp it up. Then she runs around some more =/
But yes, vomit is a very interesting subject.
A friend of mine who feeds her dog Beneful (but will not listen to a word I say about switching his food) says that when her dog vomits on the rug he leaves patches of food coloring... she has steam cleaned the carpet, and still can't get the food coloring stains up.