WHat is the strongest response against norcoss argument on puppies, pig and people

http://calebscblog.blogspot.com/2011/05/analogy-argument-on-puppies-pigs-and.html

http://docs.google.com/viewer?a=v&q=cache:W99zDmv5NzgJ:faculty.smu.edu/jkazez/animal%2520rights/norcross-4.pdf+norcoss+argument+on+puppies,+pig+and+people&hl=en&gl=us&pid=bl&srcid=ADGEESjwSofxaiUnRE2iIec-IHqTtm6iLEIswzjh-BnuN4PM-7FVV0Ei0Q03JEVqenMNn2kSD9EBdOKh3gaasYRtjGg07T6DoLGPJgb9LBvQzQ_tSjn1rh3gGzEX9Qw-kQk4rmmx4vdo&sig=AHIEtbRS-l0nzv5O7Xy0mUEqkM_SUEhuSA