We are more alike than not. From an article at the Animal Legal Defense Fund:
they have the same basic needs and desires that we have. They need food and water, of course, and to be warm or cool depending on the weather. They also like creature comforts, preferring my couch to the carpeted floor. And most seek out companionship and affection. [...]
They need to play and have a sense of fun, sometimes creating fairly elaborate games. And they have a sense of fair play and justice (something I’ve always known but that science has just recently “proven”). Basically, all the things that we claim to need or desire, we share with cats, dogs and all other mammals, really. And that’s basically it; we enjoy each other’s company because we “get” each other. We can recognize shared mammalian wants and needs. [...]
All of this commonality makes me ponder the question of why humans seem to cling so desperately to the differences between us and them.