Pfizer's Defensor I and Defensor III are the same, so that's why some say they are the same. Other companies may not do this, like Merial. Someobdy on YT said that their vet said other companies don't have identical vaccines (1 and 3 year). And for these companies, supposedly the 3 year is different or stronger. We never got to the bottom of it around here. We'd have to call companies and such...
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |