Well I think the way animals are often territorial is a sign of having a concept of the you and I thing surely?

Also pets that get jealous of other pets and new family members. Bring a new dog or a baby into a house which already has a dog or cat and see how much they HATE their owners apying attention to the new party. Parrots have been known to get so stressed out about it they start pulling their own feathers out!

I don't understand why people think animals are so limited mentally and emotionally. Where's the evidence that they're NOT emotional creatures?