I thought the same thing until my mom gave me one of her cats who no longer got along with all of her other animals. I used to live near 100s of strays and would have gladly invited them into my home but my cat refused she HATES any other creatures except me. She bit my girlfriend on more than one occasion, once when I was with them and once when she was watching my cat for me. My cat would attack other animals if I brought them near her. She is basically attached at my hip and follows me around the house even. I had the opportunity to retire very early so atleast i don't leave her at home alone during long work days or anything, she is basically with me all day long except the few hours here and there whenever I do go out.
I honestly think my cat would be completely happy to be alone with just me for the rest of her life. She hates everyone and everything else but is a sweetheart to me it is really weird she is like a Familiar or something. I bet there are other cats out there like that.
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