Failure to Communicate with a Dog

I know that the dog I’m watching misses her parents, so I asked her, “do you miss Mommy?”, and she perked up and looked at the door and started wiggling and whining.  So I said, “it’s ok baby, she’ll come get you tomorrow” and the dog looked at me with this vacant expression, like she had no idea what I was talking about.  I call bullshit.  I mean, do you understand English or not?  Jeez.