My last cat died, despite doing all we could for her vet wise, and as for who would spend thousands to treat a sick cat? who WOULDN'T? jesus fucking christ!
I'd love to have another cat, but it would shall we say, pose some rather unique hazards to a cat in this household. When my last cat was here, so was The Bitch From Hades, my former housemate (who was a complete and utter psychobitch of the very worst kind. She went out and just..well...nicked a cat. Twice in fact, one got away, so she went and stole another one, who decided to stay), no idea where from, so couldn't go and return the cat in question, and the chances of getting a straight, truthful answer out of the bitch from Hades as to where the furball in question came from, are about as high as of my being killed by a stray meteorite.)
Had to convert the lab to a bedroom while that...that creature, that fucking curse was infecting this house, not the cat, the housemate I mean, the cat I took to just fine.
But cats are curious, legendarily so, and they get everywhere. Not something one wants happening where several hundred quid worth of glassware might be set up, things knocked over here could have a lot worse consequences for the cat (and/or people living here) than in most homes. So another cat is out of the question.
It'd only take one flask full of something nasty like phosphorus oxychloride, SOCl2, something sulfurous and stinky, Br2, ICl, ICl3 etc. to raise the devil himself in terms of carnage.
Last pets were killed, too. Not by me, I'd never do such a thing, but fucking swine raided the place and I'm pretty sure used the microwave to kill my widow spiders.
Another spider would be an ideal pet, or else either a scorpion or an Amblypygid (tail-less whipscorpion, they look sort of like a very leggy, flattened out dark coloured praying mantis, similar spiked raptorial arms, Quite harmless to people, aside from capability to give a pinch, or bite if you stuck your fingers in their mouths, but not aggressive creatures, cave dwellers mostly.)
Or, perhaps a Liphistiid, from a primitive, very basal lineage of spiders, that uniquely, retain traces of the segmented body plan of scorpions, from around the time of the evolutionary diversion of spiders and scorpions, nonvenomous, although quite large fangs so could probably give a nip if pissed off, otherwise, completely harmless, and some of the malaysian species look fantastic.
I have a tank somewhere I could use to keep any of them, the widow spiders are small, and large jars can easily provide enough space for their living requirements, quite shy and nonaggressive.