Congratulations on your pup! I’m a lab lover myself and I foster too! Everyone has given you some good suggestions. Unfortunately, diarrhea is often a problem when dogs/puppies make a transition to a new home. I would definitely get a stool sample as there may be a case of worms, coccidia or giardia that you’re pup is dealing with. The best test is to have it sent out to a lab for analysis, if you’re vet doesn’t do that routinely. If everything goes well it could be a case of stress diarrhea as he adjusts to his new environment. But as others have said, don’t let it go on for more than a day without seeing your vet. 7 weeks is very young, as DogFoodie said and young dogs can get dehydrated very easily. Good Luck!
