We took Star to the vet....they ran tests, etc....$180.00 later it was determined that....1) it was just a weird coincedence, like maybe the floor was already wet when she sat down or 2) she possibly had gotten a drink (she slobbers a lot) and was cleaning herself. I think the vet got a kick out of us....because of the no color, no smell like urine...but yet we wanted her to tell us what it was. It hasn't happened since. I think we probably over reacted!!!! Oh well, sometimes better to be safe than sorry!!!