hello, my new baby is the pup in my avatar. He's a 8 week old scottish terreir named Fergus. I've had him for 5 days now and everything has been going surprisingly well. Only 3 accidents so far. However, my question is this. How common is diarrhea in puppies.Fergus was fine the first few days when he pooped then yesterday he had semi-runny poops. it would start out runny the be solid towards the end. Is this noraml and what causes runny poop?