I just took Daisy (born 6/9/09, now 3.1 lbs.) to the vet for a checkup and she had gained almost an entire pound! I thought this was significant since she basically gained half of her previous body weight and said "oh, she's so big!" and the vet started laughing. Big. Ha ha. It actually took me a minute to get the joke, because I really do think of her as big! It's that Yorkie personality, I guess.