I'm trying to have horses respond when interacted with especially when holding a custom item which will work similar to the vanilla lead. But the only thing that the horses do is rear when my item is active in the hotbar. And the message is not being sent to the console (shown with the arrow). Code fragment for my event handler:

@SubscribeEvent(receiveCanceled=true)
public void onEntityInteract(EntityInteractEvent evt) {
if (evt.entityLiving instanceof EntityHorse) {
	-->System.out.println("[Wagon Mod] player interacted with " + evt.entityLiving.toString() + " using lasso");
}
}

I haven't worked with item interactions like that, but it seems like your item isn't actually triggering the event. Try taking a look at ItemLead in net.minecraft.item, onItemUse() and func_150909_a()