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Cats and dogs are surprisingly some of the least labor intensive pets. Things like rabbits, reptiles, birds, etc are all effectively exotic pets. Not all veterinaries can or will treat them. They have highly specialized diets, and social structures. They tend to have pens or cages that need regular deep cleaning. So on and so forth.
There’s also a personal preference at play. Personally, I’m a cat person. Dogs are adorable, when they are someone else’s.
Obviously, if you’re allergic to dogs/cats, that probably rules them out (I’m allergic to cats and have 2 but my allergy is relatively mild).
Based on the 4 sentences you provided a fish might be your best bet.
Agreed.
Iirc their diets are highly specialized too. It’s not what everyone thinks. You can just give them lettuce and the occasional fruit.
I’d say most animals mask their illness/injuries well, unfortunately. Pet owners really need to know their pet well and see the very subtle changes most of the time.