I eat meat generally every day in some form or another. I concidered being a veggie once back when I was younger and thought about the animals. Then I had to shoot, skin and prepare a rabbit, and have done so with caught sea fish aswell (not the shooting part obviously), at which point I realised I was fine with it.
This is of course only my oppinion but it just feels like instinct. I could eat dog, or cat if it were offered, or horse. Couldn't eat my own, but then if I owned a chicken I doubt I could eat her either, wouldn't stop me eating something I have no emotional attachment to.