Why is it legal to kill cows and pigs but not cats and dogs?

seriously.....and no sarcasim.....that's my specialty haha j/k
Update: ok to everybody who IS being sarcastic....I ask this question because I'm a vegan and all for animal rights and I don't believe that it's right to kill any animal for our "needs" or wants...cows and pigs feel just as much pain as cats and dogs
Update 2: why is it okay to kill animals for our benefit at all? we don't need them to live...vegans are living proof....it's just a question
33 answers 33