Gary i have changed her to Royal Canin, of course she is only getting 20grms of that and 40 of her old for five days, then half and half until ten days, then she needs to be on full diet, no free samples, as she has to have So and it is only available at the vets, well it could be pure concidence,, but i really doubt it, Lexie has never had constipation before and no problems, i do blame the science diet, pure poison for my lexie. getting constipated has it appears caused some other problems now,so she is not the usual happy princess she normally is,but she is still active enough,well activity not being high on her priority list lol, and she is not desperately ill or anything, just not her normal self.