Soft puppy poop

My 16 week old puppy has been having soft brown poops for about a week. No loss of appetite, and he’s still drinking water. We haven’t given him table food at all. He’s still full of energy. Could this be related to teething?

Hello - teething certainly wouldn't have been my first thought, although I suppose that in extremis, pain could cause stress which could cause diarrhoea.  More usually, I would wonder about parasites eg worms, dietary indescretions and the diet in general.   If its been going on for a week, its probably time to seek veterinary advice.