Well, even though most big corporations put every bit of meat to use, it doesn't always mean it in a good way.
For instance, sticking all the shitty meat into dog food? Not always good for pets. For example, if you look at the ingredients for most dog foods that the average person buys, you will find that there is simply not enough nutrients in it. That, or the things that are in it can cause bad reactions in dogs. Beneful has about 1-2 stars in regards to review, and people have said it can shut down organs in dogs and other horrible things. Just because they put it to use doesn't always mean it's good. Really bad dog food is like the equivalent to McDonald's for humans. Some may argue that animals don't really need or deserve the same nutrient value, but they do! Animals can get very sick from just eating animal by-product and fats. :'D In regards to putting other unwanted things in food, I just don't really agree with it. Eating brains and hooves and eyeballs isn't really my thing, and I would rather that get disposed of as most people don't even eat it.
But yes, certain species of plants can tell when they're being eaten! Especially those that get eaten by bugs such as the caterpillar. When the plants sense they are being chewed on, they release a chemical that secretes an awful taste that the caterpillars can't stand! :3
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