I weight the well-being of animals in proportion to what I would call for lack of a better word their consciousness. I think dolphins are probably self-aware, capable of reflection, and have strong senses of pain and pleasure. I think ants are probably much less so, although still nonzero. So I place much less emphasis upon the well-being of ants than upon the well-being of dolphins. Since viruses have no nervous system and no brain, I'm prepared to give them zero value.
However, I have no evidence that dogs are more aware than pigs are. Any personal preference I have for dogs is because they're cuter than pigs are, which seems like a bad way to make moral decisions. So I am not prepared to make pigs less valuable than dogs.
I never thought about it in terms of your two-different-kinds-of-chicken-breast problem, but I would agree that this would require an actual calculation to see whether the money saved could prevent more suffering than was caused to the chicken. Given the low probability of me actually going through with donating $1 more to charity just because I bought a $1 cheaper chicken, I'd probably take the more expensive one, though.
Any personal preference I have for dogs is because they're cuter than pigs are, which seems like a bad way to make moral decisions.
I think you've deliberately muddied the waters by throwing in the word 'cute' there. You justify your general rule for preferring some lifeforms to others by saying you value 'consciousness' but then say that preferring dogs over pigs for 'cuteness' is not a good way to make moral decisions. If you take away the loaded words all you're really saying in both cases is that you value animal A more than animal B because it has m...
I have noticed that among philosophers, vegetarianism of one form or another is quite common. In fact, I became a vegetarian (technically a pescetarian) myself partly out of respect for an undergraduate philosophy professor. I am interested in finding out if there is a similar disproportion in the Less Wrong community.
I didn't request that this go into Yvain's survey because I want more information than just what animal products you do or don't eat; I'd also like to see nuances of the reasons behind your diet. There are a lot more shades than carnivore/vegetarian/vegan - if you want to be a vegetarian but are allergic to soy and gluten, that's a compelling reason to diversify protein sources, for instance. I'd also like to hear about if you avoid any plant foods (if you think they're farmed in a way that's environmentally destructive or that hurts people or if you have warm fuzzy feelings for plants, maybe). Here are some questions that come to mind: