Unfathomable, and thankfully not something I have to worry about (there are animal shelters near you that will just give you a cat if you give them money)
For example, I've had fairly good success upon a range of animal companions going back to early childhood, but a few years ago, I made the mistake of taking on a 'problem cat' from a family friend.
Such a beautiful creature, but she just couldn't... settle down, I guess are the words. Now me, living with a terminal disease is already hard, but unfortunately, that rascal just turned it up to '11,' bless her lil heart. So in the end, I had to donate her to a local no-kill shelter. Not my finest moment, but the lack of sleep was pretty-much the lynchpin, for me.
I love cats, but I just... haha, kinda got spooked hard by that experience.
Adorable picture :)
Unfortunately my cat has found a purpose - being a bastard and knocking over anything she can, and loudly demanding attention at 2am. She's still wonderful of course!