how old is sadie again? I would def have the vet check for worms. Just because the breeder said she got worming meds doesnt mean it cured anything. Also it could be otc meds which may not have been as strong as a vets meds. i would also look at the food. did you switch it? switching can cause watery stool also. the last thing i could think it may be would be just the new enviornment, and the stress of being taken from the place she knows to a whole new place!! please keep us posted on what your vet says.