Last time I checked the situation in the OP was about a human and a pet. Yeah, we weren't talking about ecological sustainability.
You the one who has been asking questions farther and farther from the topic.
I don't recall of any animals having intellectual capacity on the same level as a human. I'd love to see a monkey conducting evolutionary genetics research. I really do.
What is an intellectual capacity? How do you measure it? Common human can not even understand his own psychology, and measures intelligence of others based on their communicability, education or compliance with local culture. Common human tries to apply human psychology, even life style and cultural patterns to an animal. You did the same just now. Common human never tries to put himself in place of an animal and its world, because he is anthropocentric and conformist, and only interested in human world.
Humans do evolutionary genetics research because humans have mechanisms of communicating knowledge to each other, storing it and transmitting it from generation to generation. This ability does not depend on intelligence so much as on other body and brain features.
All those sciences and knowledges are products of civilization history, but not of an intelligence of one random human, though he has access to them through those mechanisms of knowledge storing and communicating. So when it comes to comparing human intelligence with animal, you actually compare summarized intelligence of millions of humans of whole history with summarized intelligence of only a dozen of animals at best.
Weaker, if you discount the technology. If you're so concerned about the strength of the body, genetic engineering and biological enhancements can help.
You are too optimistic about technology.
Practically every new technology weakens physical abilities of human, to say more - intellectual abilities too. Technologies make people dependable on them, even addicted.
Also, your biological "laws" still don't illustrate why the pet is worth saving MORE than the human.
Look. I didn't said that. You trying to read between the lines.
I said
they are equal by default.
And because the pet is mine (so it is a friend, or part of the family, or the creature my own life depends on, if i were an Eskimo for example

), and the human is a complete stranger, I've chosen the pet.