u/Ashamed-Magazine-535

This morning my puppy had some bad diarrhea and he seems a little more withdrawn. He will drink water but won't really eat, hes about 3-4 months old and has had his first parvo shot but not a second yet (dues this weekend) im not sure if he just has a sick stomach and im overthinking or if I should race him to the vet lol I can't seeme to add a picture of his diarrhea for some reason (I'd blur it ofc) but its brown and real watery. I know this isn't much to go of off i can send a picture in DMs but any advice would be helpful. Edit: he ate a few wild blackberries yesterday so im not sure if that's the culprit. Edot 2: Thanks for all the helpful comments he's tested negative for parvo and is due for his last immunization this Friday. Whether it was the berries or something else he was merely sick and he is now taking small amounts of food as advised by the vet. Benny is good.