Don't use cats for examples, people. Cats suck hard.
Anyway, on topic, I have one issue with your post, OP.
JoJo said:
The aliens have far longer a lifespan than humans and so when you get old and too expensive to keep, they have you euthanatised, cry a few crocodile tears and then forget about you when they go buy a new pet human. That is your life.
Were this in a different setting or site, where civility wasn't praised, I would have said some very nasty things to you about this sentence.
Your implication that my love for my late dog wasn't real, that my tears shed while she died in my arms was fake, or that I have forgotten anything about the girl that I spent twelve years of my life with despite having a new dog that I love just as much...
Any words that I could say to describe how I take that implication would get me banned outright.
Fuck, I'm in tears just from typing that.
Goddammit. I miss Holly =(