When it comes to animals there is no such thing as cupboard love. Or, to put it another way, all love, whether non-human or human, is cupboard love. All creatures love for a reason. Even those humans who are fortunate (or self-dellusional enough) to love everybody do so for a reason.
But love is not the motivation for love. It is what comes from the motivation in the same way that happiness follows a fortunate event. It is a real thing in its own right. When animals love it is of the same type as human love and the animal will feel the same emotion as humans do. It may even be a purer, stronger love than we experience because it is not made provisional by complex thought.
When a cat or a dog looks at you with loving eyes they are not trying to trick you into feeding them or for some other reason of self-interest. They have already achieved that aim. Their look of love is because they love you. To deny this is arrogance at its most human. The arrogance of a species that believes it is has been separately created and superior in all things to the rest of creation. It is this arrogance that is destroying the world. If we could only love as authentically as our pets love us we could save our planet and ourselves. Unfortunately, unlike the love animals experience the love humans experience is rarely anything other than self love.