Like this animal can solve a puzzle thus it can't be farmed. The other animal can't. But if we scare/hurt them they both react in fear/pain.
IQs are we talking here? Suduko? Puzzle? Open a door? Use a tool? Care for its youngs? Stand under roof when it rains?
I can wrap my head around both stances (eat animals freely or full veg only)...bit this arbirary line in sand approach I struggle with. May as well go with an arbitrary "this one is cute so we won't eat it" approach