Ni means traits like being good at reading signs and anticipating what's going to happen. An Ni-dom animal is also stubborn and can seem "detached" and it can be seen that they observe the big picture instead of details. I would presume that a lot of herding dogs are Ns. My own dog, a rough collie, is pretty stubborn and seems "detached" and she seems to see the big picture. I'm not sure yet wether she is exceptionally good at reading signs and anticipating what's going to happen... I'll have to observe her more closely. But she's a strong candidate for being Ni-dom, imo
I haven't really thought about what Ne would mean in animals... but I guess it would have something to do with seeing the big picture, as well. And being easily excitable.