He is 7 weeks old and all he has is running poop sometimes maybe not to bad but still very soft. What's wrong should I change food ? Or what should I do I feel like he poops all the time more than he eats.

Is this puppy from a litter that your dog had or did you adopt the puppy?

How long ago did you get the puppy? At 7 weeks he should still be with his mother and litter mates.

Did you change food when you got him? If so, did you do it gradually, mixing the new food in with the old, or did you just switch from one food to another?

Is the puppy up to date on his shots?

Where did you get the puppy?

As you can see, we need more information before we can guess what's wrong. Even with more info though, it will be a guess. We can't examine the puppy, so there's really no way for us to be sure what's going on.

Your best bet, if you're worried, is your vet.