I think humans should rightfully be considered separately from other animals. Humans are highly intelligent, self-aware/reflexive, and socially and emotionally similar to myself. These are what I think is important. Because of these, I have great empathy for other humans, and it makes sense to construct societies and moral systems around humans.
What about great apes that have demonstrated self awareness, and who are able to communicate with humans via computers? Would you be okay with experimenting on an animal which literally can beg you not to? That's really what gets me, but I know that's really an emotional rather than a rational reaction. Or what about the hypothetical situation where we have other hominids which, while still not human, are far more human in abilities than a bonobo ?
In comparison, even the most intelligent, most similar non-human animals are nowhere near as intelligent as we are, often fail the best tests we have for self-awareness, and have at best an underdeveloped theory of mind (understanding that other individuals are independent, thinking agents), let alone the advanced empathic and social abilities that we have. Some animals do very well at some of these, I understand that dogs are highly socially intelligent, often solving theory of mind problems that our great ape relatives fail, but no animal seems even close to our level in the majority of them.
Actually, it's not so much as dogs are able to do things that great apes can't, it's that dogs agree to cooperate in experiments that great apes won't.
One of the reasons dogs are so useful in experimentation is because more than any other animal they seek to please the humans doing the experiment. They are simply willing to DO the experiment in the first place. That's the single biggest problem with animal behavioral/intelligence experiments. In order to test them, the animal has to participate in the test. Dogs, as well all know, are very eager to please, and so they are great experimental subjects and as a result we know a LOT about dog intelligence and behavior. Great apes tend to be more obstinate, and their likelihood of particpation correlates to what the ape gets out of it's participation. They just aren't as likely to do something because we WANT them to as a dog is. The experiment has to appeal to them enough to get them to cooperate with it.
No cat owner will be surprised to know that cats are one of the most difficult animals to do behavior/intelligence experiments on. There's a well known case in which researchers were trying to get different animals to go through a maze. Even animals like mice or goldfish were able to complete their mazes, and were able to show improvement in their times with repeated exposure to the same maze. When they tried to do cats though, they were not having any of it. They refused to even try. They just plunked their furry little buts down and screamed until the researchers finally gave in and took them out. It's not that goldfish are smarter than cats. It's that the cats were less willing to do the maze than goldfish.
So when considering animal exerimentation, it's important to remember that while an animals completetion of said experiment is evidence of that animal's abilities, an animal failing a specific test is not
necessarily an indication that the animal is incapable of performing the task at hand. It just may simply not want to.
Which brings up another interesting concept. Would these specific individual animals otherwise exist were it not for the experimentation? Is that a factor?
To me personally, that's irrelevent. Again, with primates, I apply the logic I would to human experimentation. Just like it's not okay to breed babies to inject them with AIDS, that's how I feel about great apes as well (which isn't to say that I think a chimp is the equivilent of a human baby).
Have you ever intentionally killed an animal?
Not to my knowledge, unless I was too young to remember.
I also try and avoid killing bugs when I can, I always try and catch and release them when I find them on me or inside a home. But generally I save bugs when I can; if I see a worm on a sidewalk, I will take the time to put it back on the grass. Once I found a drowning bee while I was swimming across a pond. I took of my hair elastic and let the bee grab onto it, then I held the elastic up out of the water as I swam 15 minutes to shore. People will tease me about this when they see me do stuff like this and say, "Why did you take the time to save a bug? What does it matter?" To which I always reply, "It matters to the bug." I just believe that all life is precious, no matter how small. I don't think this view should be imposed on others. I don't want to illegalize meat eating or anything like that. I'm well aware of the harsh reality of the animal world. But that doesn't make me feel any less guilty if I have the opportunity to save even a tiny little life, and I don't.
Oh, and as to the OT:
1) I'd slaughter my dogs in an instant if it meant the life of my kids.
I see your point, but at the same time, if I had to chose between a 95 year old stranger and my 6 month old niece, there would be no question of who I would save. But I still would not be okay with cruel experiments on a 95 year old stranger.