I guess it depends where / how you grew up.
Growing up on a farm (or in a rural community), you come to understand how the world goes around.
Pet lambs, yum yum
Eating tropical fish? Bit harder, since they are with you all the time, a sheep, its still a mass of wool that follows you around because you give it milk
That behaviour changes after about 2 years, no longer do they want to be anywhere near a human, because it dosent provide food