I am the queen of runny puppy poop! Bogey has had on and off runny poop since I got him- he is 5 months old now! At the first signs of runny stool: go immediately to a bland diet (boiled hamburger-lean, white rice and a little low sodium broth. ) Add tbsp canned pumpkin(not pie filling) to one meal. Stools should firm up within 24-48 hours. If they don't, he needs a parasite check. They can also pick up bacteria from the soil, esp at doggie parks. If it shows in his stool, the vet will put him on Flagyl which really helps kill the bad bacteria. After 4-5 days of bland diet, THEN you can reintroduce his kibble SLOWLY- I mean take over a week to get back to his normal diet. Once back on that, I start probiotics to help with gettingthe digestive tract healthy. Good luck!!