I was just curious if anyone out there has ever heard of a dog who was fully vaccinated getting parvo. At our hospital we have had 4 cases of dogs who are at least 6 months old and have had 4 parvo vaccines. The vaccine company that we use is shearing-plough (not sure of the spelling). Does anyone know if the virus has mutated to a new strain, or if Shearing-plough is having any recalls on their vaccines due to contammination? Another possibility is the temperature of the refrigerator that we keep the vaccines in. I know too hot or too cold of temperatures can inactivate the vaccines. If anyone has any information it would be greatly appreciated.