There's a reason they say that dogs are man's best friend. They provide companionship, love, and something to look at when you're home alone. I talk to my dog all the time, and I swear he understands what I'm saying. I'll go on long monologues about my life, and he'll just sit there, look right at me, and listen. I know every dog owner thinks their dog understands them, but it's not such a far-out idea.
Based on the amount of time they spend in our proximity, it would only make sense that they would pick up on some phrases here and there. Just like how we pick up on their noises. We know what a scared bark is versus an excited bark versus a grunt of confusion. We may not speak the same language, but we know each other well enough to converse with some amount of ease. These dog memes prove we know what they're up to.