WEIGHING IN ON URINE: Urine weights in litter, although theoretically possible, are not recommended. First, it just introduces another variable into the equation, increasing error. Second, litter hates to stay in the box (a self-preservation instinct I suppose), making it hard to get an accurate weight; how do you weigh the damp litter stuck to the bottom of the ferret's foot or butt? Can you find all the litter flipped out of the box? Finally, it makes it hard to use the urine for other tests. For example, in ferrets with limited urine output, I am concerned not only with output, but also with various testing values. In this case, I tare both the weight of the paper towel AND a test strip, collect the urine, test it, THEN weigh both the test strip AND the paper toweling to get a urine weight. It's a sort of 2-for 1-deal than you cannot do if litter is used. (4 emails) Bob C PS: Sorry Bill, I didn't mean to confuse you with the "4 emails" note. When people write to ask me questions, I pick out a quote, and copy it into my word program with the note "1 email." As I get more emails asking similar questions, I increase the email count. Because I have limited time, I try to answer those questions with the highest number of questioners first. All "4 emails" means is four different people wrote me and asked simiar questions. I simply forgot to erase the notation. I wish it was a bit more nefarious. I know, how about we all pretend I'm sending secret messages to the FLO.... [Moderator's note: 5 FLO. BIG] [Posted in FML issue 4417]