I have Labrador puppy above 1 month. Since yesterday he's been having a green watery stool. He is been weakend a lot since 30 january i first brought him home. He has lost so much weight. I have fed him ceralac for puppies for two days. Then he did not eat it. Then i brought pedigree for small puppies. Yesterday he ate that in the morning and had proper stool. But then in the noon he had green colored watery stool. Early morning at 3 am and 6:35 he had loose motions again. What to do?