While I have to admit I don't know anything about this PetPac organization, I Googled them to read some of the information on other sites and the first one that came up is this,
http://www.petpac.org/So for me personally, I will be very cautious about what I would support...although it is certainly not PETA. But along the way to vocally opposing PETA, I would not want to support some other organization that has its own personal agenda.