At 6-8 weeks of age puppies should receive their first vaccination; this is temporary and needs to be followed up with another one at 12 weeks. After the 12 week vaccination you can then take your puppy out in public areas.
You can be contagious from a few days up to two weeks or more, depending on which virus is causing your stomach flu (gastroenteritis).
In people with stomach flu, the incubation period may range from 4 hours to 1 to 2 days, depending on the type of virus that is causing the infection.hen a person becomes infected with stomach flu, the virus begins to multiply within the small intestine. After approximately 1 to 2 days, depending on the virus, stomach flu symptoms can appear. This period between the stomach flu transmission and the start of symptoms is the stomach flu incubation period..