I wonder what fish and sharks think of whales and dolphins that have to surface to breath. I can totally see it "get out of here air breather, go hug the surface."
Only humans hate others for being different. So no, I’d imagine they wouldn’t think anything like that at all. In fact, I’d bet they would be incredibly curious and ask tons of questions.
I think you're misinterpreting, I meant dogs of different breeds bring chill with an unknown dog of their own breed, while trying to get rid of dogs of a completely different breed, even if those have lived in the same neighbourhood for years.
Horses of different breeds in the same stable still have a hard time trusting each other, but not with one of their own breed, even if that's a visitor.