I'd like to start by saying that I'm playing 5E, and with that, my question is whether there's has ever been in D&D in general (1E-5E) a ruleset for dealing with the idea of having Vanity Pets. I.e., non-combat capable pets. So the kind of pet one might have if they're not a Beast Master.
Is there anything stating that those are against the rules, or in any way break the game? I mean, if you would like to have it as part of your backstory, and/or for purely RPing purposes? I'm trying to think, but I can't really see if that would give any single player an edge over another.
I ask because the group I play with is preparing to start another campaign after the one we're on finishes, and the two people who are co-GMing, aren't sold on the idea of a non-combat pet, mostly coming from a rule-based perspective. As I understand, the main concern is that I might be getting something out of it that they can't see yet, something that would give me a work around the rules, or some sort of advantage. Which is way over thinking it, since I just want some sort of vanity pet that follows my character around 'cuz backstory...
That said, this is something that I am curious about for my own reasons, because this is something that I've been thinking about trying to encourage players to think about for a campaign I'm putting together. And if this does indeed cause an issue, I'd like to be able to see it so that I don't end up breaking the game for my players when I end up GMing myself.