My 11 week old puppy had her checkup at the vet and got a clean bill of health. Stool sample was a bit on the loose side but was ok. Told vet that she had diarrhea the day before. Well, she was still having diarrhea 4 days later so I called vet and he gave me Metronidazole 100mg/ml 1 ml 2x day for 7 days. Well, she has had 3 doses of the med and the diarrhea has not gotten any better and I am concerned. She is active, playing, barking, drinking and eating. She is not having diarrhea all over the place just when I walk her (once or twice she did on the newspapers). Any advice as to when the medication should work or what I should do?