I have had 3 puppies to the vet this week with the runs. And after a few days the poo turned olive green. They ended up going off they're food and had a temp. Under my vets supervision I am injecting fluid under the skin every 3 to 4 hrs to keep them hydrated and injecting Antibiotics every 8 hours. I am also treating them with Baycox for piglets and small animals. they are looking better but still have a few days of treatment.