Can Ethical Vegetarians and Vegans Own Carnivorous Pets?

Introduction
One thing you learn pretty quickly in philosophy is that committing to a particular principle often commits you to unexpected positions. Since becoming vegetarian I'm starting to realize this a lot in terms of the principles that ground my vegetarianism.

Here's the issue: It seems that the principles that ground vegetarianism or veganism commit us to the conclusion that it's unethical to own carnivorous pets. Lets look at the principles that support vegetarianism and veganism and see how they apply to carnivorous pet ownership.

(Note: For economy I'm going to use vegetarianism to refer also to veganism and "pet" to refer to carnivorous pet).

Argument 1
The most common reason people become vegetarian has to do with Peter Singer's argument which , in abbreviated form, goes something like this:

(P1) Factory farming causes animals to suffer tremendously.
(P2) Suffering is bad and we shouldn't cause it.
(C)   We shouldn't eat factory farmed meat (or any meat where the animal suffered).

Notice this argument isn't against killing, only against suffering. The objection to killing a separate reason to reject eating meat which I'll set aside for now.

Here's the problem for people who accept this argument or something like it: Pets eat factory farmed meat. By owning a pet you are contributing to the suffering of many other animals--the very thing you oppose.

It seems as though having a pet is contrary to a vegetarian's ethical commitments.  A vegetarian can reply (in some cases): I adopted this pet and I wasn't going to just let it die.

Even if this is true, (P2) seems to commit us to a startling conclusion: we ought to euthanize our pets. Here's why. Lets take for granted that more suffering is worse than less suffering.  Your pet has had a pretty good life. Except for the time it spent before you rescued it, live's been pretty good. Almost no suffering. Now, keeping your pet alive over its natural lifetime causes the suffering of many other creatures equal in their capacity to suffer with your pet. Their suffering is of no lesser moral worth than that of your pets. If we are truly committed to (P2), that suffering is bad, and we should cause less rather than more suffering, it seems to follow that we ought to euthanize our happy pets. It will cause less over-all suffering.

Argument 2
If your vegetarianism is founded on the idea that eating meat is wrong because killing is wrong, there's an analogous problem.  Lets apply the famous trolly problem to see why.  A trolly is barreling down a track and will kill 5 workers working in a tunnel ahead. You can pull a lever and divert the trolly to another tunnel with only one worker. Should you allow the 5 to die or pull the lever, saving the 5 but causing only one worker to die? Most people say pull the lever.  It's better to save 5 lives for the "price" of one. So, if we accept this principle and say the lives of animals are of equal value (at least with respect to each other), it seems to follow that we should euthanize our pet (or at least not feed it) to save the 5 animals that will be slaughtered to feed our pet over its lifetime.

Argument 3
You can also run all the same arguments in regards to the environmental cost of raising animals for meat. Owning a pet causes more animals to be raised for meat. More animals=higher environmental cost=more bad. If you euthanize your pet, those future animals don't need to be raised for meat and there is less of an environmental impact. Fewer animals=lower environmental cost=less bad.

Weak Counter Argument: Causal Inefficacy
One way to reply is to say that "well, euthanizing my one pet isn't going to change the meat industry/how much meat is produced." Vegetarians hear (and reject) a version of this same argument when people object to vegetarianism. It's a bad argument. To see why, imagine the pre-emancipation slave owner saying "well, even if I free my slaves, everyone else is still going to have slaves and probably just take my freed slaves anyway." Is this a good argument? Nope. Owning slaves is morally bad regardless of what other people do. You're responsible for the moral consequences of your own actions; what other people do isn't relevant.

Conclusion
As a vegetarian, I don't like any of these conclusions but they seem to follow from the principles I've accepted.  At the very least, the principles suggest that, if we don't euthanize our rescued pets we at least have an obligation to ensure that all pets should neutered/spayed to prevent future pets from coming into the world. Also, that once our existing pet dies (naturally) we shouldn't get another pet--rescue or otherwise. That sucks. I can't imagine my life without doge.

Can Vegans Make Broth from Dead Vagrants?

Introduction

For the last half-year or so I've been thinking about the ethics of eating animal byproducts. Here's what I mean: Let's suppose that you believe that it's unethical to eat factory farmed meat and dairy (or any meat or dairy--nothing important to my argument hangs on this).  As someone who lives according to your considered ethical judgments, is it permissible for you to eat by-products from the meat and dairy industry that would otherwise be thrown out?

Before continuing I should make one thing clear: These arguments only work so long as the byproducts would (a) otherwise be thrown out and (b) do not contribute to the demand for the primary product. Also I'll need to assume that current conditions persist, that is, the majority of the population isn't vegetarian and there is significant demand for the primary products.

Case 1: Whey

Let me give you some examples of by-products. Whey is a waste by-product of cheese-making and greek yogurt production. Its disposal is actually a significant environmental problem since millions of tons are produced every day (in the US alone) [see: cheese, greek yogurt]. In a whey (sorry, couldn't help myself)  eating the waste product is a net environmental good. If left unconsumed it would otherwise have to be treated in an industrial digester which is an energy intensive process. Also, simply dumping it into nearby water sources contaminates the water and kills all the flora and fauna and so it cannot be done. 

There are two basic arguments for why it might be morally permissible for a vegetarian or vegan to eat whey products.  First of all, there's so much excess whey from primary dairy processes that your actions don't perpetuate or generate additional demand on primary products (i.e., milk/cheese). That is, consuming whey doesn't cause milk producers to produce more milk or cheese. Second, consuming whey actually minimizes the environmental impact of the dairy industry. Instead of excess whey contaminating the environment, we eat it.

There is a possible counter-argument. By consuming whey we create a market for it which makes it cheaper for the dairy industry to get rid of it. Currently they have to pay people to take it (e.g., farmers who use it fields or to feed animals, and whey product producers).  If the cost of disposal is reduced, the price of primary products also comes down (because total production cost is lower since disposal cost went down). If the cost of primary products comes down then standard economic theory predicts demand for primary products increases.

I'm not quite sure if this argument works. I'd need to consult with an economist to know for sure but here's one possible way to reply. Suppose we agree with the counter argument that the cost of production for cheese and milk will come down thereby increasing demand. Baaaaat! If demand for milk/cheese increases so will the quantity of byproduct (whey) produced and since the vegetarians are already eating as much as they can, the cost of disposing of this extra waste (from producing even more milk and cheese) will also rise perhaps causing the price of primary products to settle back around where they started. I'm no economist but anywhey, lets look at another case...

Another thing to consider is that we might already be at peak whey consumption. Also, the amount of whey that vegetarians and vegans might consume (that don't already consume it) could be negligible in terms of how much excess there is. Recall that there are several million tons produced err' day.

Case 2: Animal Carcasses 

I came up with this next case as a result of motivated reasoning. It's freakin' cold in Ohio and I've been making a lot of legume soups and stews. What I'd really like is to use a chicken broth but being a committed (albeit imperfect) vegetarian, I don't buy chicken or chicken bouillon. 

But I was thinking... Suppose an omnivore friend had roast chicken for dinner and was about to throw away the carcass. Would it violate vegetarian or vegan ethics to use the carcass for a broth? I guess what I'm really asking is if there is something intrinsically bad about consuming animal products or is it only bad because of how they got on our plate? 

I think the reasonable answer is that eating meat isn't intrinsically bad, it's only bad if certain ethical conditions were violated in raising and/or killing the animal. I doubt there's anything morally wrong with eating roadkill or eating an animal that died of natural causes. It might not be a very appetizing thought, but it's hard to see why a vegetarian or vegan would say it's wrong.

The only possible argument I could think of is if (a) you think it's just as wrong to eat an animal as it is to eat a human and (b) you think it's intrinsically morally wrong to eat humans. Suppose we agree with (a). Is (b) likely?  I don't think so. We can all probably agree that it's wrong to kill someone to eat them but if someone died of natural causes and you were starving, would it be wrong to use them for soup? Probably not. You might have an aversion to it but it's hard to see why it would be morally wrong. 

Of course, the case of my friend's chicken carcass is a bit more complicated than eating roadkill.  The vegetarian/vegan will be ethically opposed to how the chicken got to the plate (especially) if the chicken was conventionally raised and killed. That said, the vegetarian/vegan's actions don't generate demand for the primary product (i.e., don't support or perpetuate the meat industry) and the byproduct is going to be thrown away anywhey.  In such a case, is there any harm or is there a wrong?

I'm curious what my vegetarian/vegan friends think.  By the way, I'm headed down to the morgue to get some bones to make both. Let me know if you'd like me to get some for you while I'm there.