Many of those who are most opposed to cruelty to animals in the laboratory, in the slaughterhouse, or on the farm are people who truly love animals and who keep pets.
Evidence
Many of those who are OC → P most opposed to cruelty to animals in the laboratory, in the slaughterhouse, or on the farm are people who truly love animals and who keep pets.
The vast majority of P → FM domestic pets, however, are dogs and cats, and both of these species are usually fed meat.
Conclusion
Many of those who are OC → CC most opposed to cruelty to animals do, in fact, contribute to such cruelty.
Evaluate
The argument assumes FM → CC that feeding meat to one's pet contributes to cruelty to animals.