I'd guess because dogs, cats, horses, etc are domesticated, where most large birds are not and are either wild caught or have wild caught in their immediate history and thus are not at all adapted or suited for home living the way most people provide it. (I suppose the 'non domesticated' part is the same for reptiles, but the needs of birds and reptiles differ SO much it's like two ends of a scale!) I am not saying I agree or disagree with the mindset, just offering a possible explanation for it and giving an example from my personal knowledge.
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