When you are sitting on the sofa with your dog, his head in your lap, and he looks up at you adoringly, you know he loves you. When he sits with his gaze locked onto the treat you are holding up and he starts drooling, you know he wants it. Dogs don't have to talk to communicate, but sometimes they do. And these days "bow wow" is not all they have to say.
Take a look at this YouTube video of talking dogs -- it has been viewed over 14 million times and has a 5 star rating. You'll see a big dog looking into the camera and clearly saying "I love mama." You see a woman sitting on the couch with her dog and they take turns declaring "I love you!" Imagine being greeted by the gravely-voiced dalmatian saying "hello." A dog who is offered a treat, whines "I want it!" And it ends with the white fluffy dog imploring "I want my mama." Does your dog talk?