Parvo is a highly contagious disease that causes diarrhea and vomiting. The most common way to transmit Parvo from one dog to another is via contaminated feces. Parvo can also be carried on the dog's hair and feet. This is why it is so important to not have puppies around other dogs you do not know until they have two sets of shots minimum.

Since Nebo has not been vomiting, if it is Parvo then it is in the early stage and can be treated. A lot of adult dogs carry the Parvo virus but are not as susceptable as puppies because they have more mature immune systems and are vaccinated against the disease.

Get Nebo to the vet tomorrow morning and let them diagnose. It may be just he ate something that doesn't agree with him. In the mean time follow Sandra's advice about hamburger and plain rice. This binds the dog and is easy on the digestive system. Keep us posted.