Arena target pet macros always gets main pet (I don’t use this way tho)
Another is if you have big debuffs only one of the pets gets Aspect of the Wild, that’s the real one
When they use RoS/MC the main pet dashes to the target
Psure barbed shot (frenzy stacks) only go on main pet but don’t completely remember that one
Also look for raptor/rodent/hyenas, if one pet is one of those and the other is just something weird like a spirit beast it’s an easy tell but also they’re being a bit dumb by not using two pets with same visual and name