Human bodies do need meat. Our brains developed bigger because we started eating meat. Without meat we would keep being not very bright apes. Why? Because plants require a lot of time of gathering and eating, while with meat you have to eat less. So more free time is used to think.
I don't like the taste of meat, but I do know that I have to eat it. I only eat cow, pig and chicken, though. I only eat what my body tells me I need, since I don't like the taste much.
Sheeps do actually like to be sheared, specially in summer in hot climates.
And cows love to be milked, specially by hand, not by those machines.
Dogs are a subspecies of wolves. Most people won't like to eat dog because they have an innate bond with them, it's in our DNA. You could call it a 'symbiosis'. Most dogs understand human body language and tones of voice, and many humans can do so with dogs.