As a kid I was surrounded by cats, some mice, a gerbil at one point and fish. Mixing up different species when you don't have control of the one does not make for good companionship. They were pets, things to have and that is obviously something to frown upon. They weren't mine either and I've since discovered that I'm very allergic to cats, so more shame on her
I wanted a dog, always and had never considered anything else. Fast forward to this year, I was looking after a dog of a friend's for the first time and putting in a lot of work. She got hurt and needed time to recover, and after she did, she got ill. Dogs are definitely too much work and too much responsibility (and too pricey) for me at the moment, if anything happened. I would guess rats must be cheaper to help and of course are less likely to run off and get hurt on a walk because they won't be taken out of the house

That's not the reason though.
They're emotionally attuned, they're smart and I need the companionship. I'd never thought about them until I realised a dog wasn't feasible in the slightest and I had to research another species-- remembering that I had seen posts and videos about how lovely they are and I've never been scared, apart from once in a cinema, but that one was the size of a small dog and way faster

I can't have rats where I am either, so I'm looking to move somewhere suitable for them, and me. Hopefully in the next few months

Plenty of time for more research and obviously after the move, time to buy everything they could possibly need or want XD