Maybe just call the vet to be on the safe side but I would think less yellow urine would show less concentrate due to fluid intake. Still, any vet worth his salt won't mind a late night call if you're really scared.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |