Mojo has some dominance issues. He likes to keep Marley off of the mattress and banish her to the depth of hiding underneath the bed. Here he is staring her down, daring her to come out and play:

He then leapt off the bed and landed on her face, and she tried to retreat under the bed.

Here, he proudly sits, thinking he is the only dog in the frame. Her paws can't let him take all the glory.

As he heads out to inspect a slight rustling somewhere down my hallway, she checks for clearance.

This is my favorite shot. This is Marley's "I am free, but still really scared" look. She too ran towards the rustling, and then immediately pulled a 180 when Mojo realized she was out of hiding and gave up on protecting us all.