I'm a big pet and nature guy, but I make it a point not to befriend cows, chickens, pigs, and fish.
That'd be about as weird as befriending a carrot...
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But seriously... I'm all for vegans and vegetarians who chose to be so for health or good causes (fighting cruel factory farming), but I've always said that "because they are cute and fluffy" is not a good cause. Even so, adult chickens, cows, and fish aren't cute or fluffy IMO. Pigs, OTOH, can be cute but, thankfully, not the giant kind we raise to eat!