2 weeks is a long time for your pup to be having runny poop...has she been wormed recently? My Pixie has runny poop right now..started yesterday..so off to the vet we go..i know what the cause probably is too...she got to some Rabbit droppings while out for a walk the other day!
everytime she manages to eat any i just KNOW what effect it will have on her! she seems to love the stuff! and cat poop too! eeeewwwww!
keep your pup away from Rabbit droppings! it really upsets their little tummies!
I agree with above comments though...a vet visit asap.