How can I teach my dog to bark? She is a 2 year old labrador. The only time she ever barks is when she is in her outside pen and sees me drive home from work. That's when she barks continually until she sees me come out of the house and walk towards her pen. Once she sees me head her way, she stops barking. I always bring her in the house with me when I'm home. When I let her out to pee, she does her business then comes back to the door and just sits there waiting to be let in. She doesn't bark to let me know she's back. I thought that because she can see inside because it's a glass door, she just waits until someone sees her, so I tried waiting her out. I hid and waited. She just sat there staring inside. I've tried sitting the curtain. I've also tried just sitting on the sofa and ignoring her, hoping she'll bark to get my attention. She just doesn't bark. What can I do?