concerned about my chihuahua

Question
my chihuahua has had his shots for parvo and has been dewormed, i've been told i might have parvo in my yard..it makes me very paranoid everytime my dog gets sick. lately hes been pooping with blood. he eats and is very active so im not exactly sure if thats wat it could be..he has an appointment on tuesday  i just wondered if it could possibley be something else?

Answer
If your dog has been properly immunized for parvo, you don't have much to worry about.  There are many reasons for diarrhea.  I would suggest giving the dog some pepto bismol (1 tablespoon per 25 pounds) three times a day to help control the diarrhea until you can get to the vet.