ask her if it looks like this as demi had this and i ran her into vet had in house fecal, lab culture and lab fecal and $300 it was nothing and gone in a few days. She acted totally normal. If it is hge you will know it the dog will be really sick and the stool is raspberry jam looking diarhea as the red blood cells multiply rapidly
here is a link of what demi had as sounds like the same thing check out the pics
DEMI POOP pictures by dwerten - Photobucket