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Originally Posted by Ellie May  Pups have maternal antibodies at that age. That vaccines just interfere with them and then the vaccine and the maternal antibodies may be ineffective leaving the pup unprotected. Vaccines also have to be given 3-4 weeks apart to be effective. |
Crystal is absolutely right. Those vaccines Cali had were absolutely worthless. They shouldn't get their first vaccines until they are at least 9-10 weeks old.
A study of a cross section of different puppies showed that the age at which they were able to respond to a vaccine and develop protection (become immunized) covered a wide period of time. At six weeks of age, 25% of the puppies could be immunized. At 9 weeks, 40% of the puppies were able to respond to the vaccine and were protected. The number increased to 60% by 16 weeks, and by 18 weeks, 95% of the puppies could be immunized. Maternal Immunity: Passive Disease Protection from the Mother in Dogs Vaccination Options/Prevention