Boxer puppy throwing up

Question
I have two white boxer puppies who are about 8 weeks old.  One is doing well & gaining weight, while the other has started throwing up every once and a while and looks kind of puny to me.  What could possibly be wrong?  Could it be parvo or something?

Answer
If your puppy has not been vaccinated, parvo is a definite possibility.  However, I would recommend a trip to the vet as it could be something as simple as worms because puppies are usually born with worms.  So take a stool specimen.  I would automatically give him deworming such as Panacur or Drontal to be safe.  Try feeding a bland diet of chicken or burger and rice with yogurt to see if that helps settle his stomach.