Merlin doesn't quite know what to say to Arthur's slightly smirk. There are several things wrong with that situation, firstly that Arthur is actually already awake and dressed when Merlin goes to wake him, even though Merlin is on time for once.

Secondly, that look is solely for when Arthur has done something or thought of something that he thinks is clever, and he rarely manages to be successful at either at this kind of time in the morning.

And then he sees the dog.

He groans.

"What's wrong, Merlin?" Arthur grins at him. "I thought this is what you wanted - you complained so much about following me around, I thought maybe you were jealous."

Whoever Arthur purchased the dog from had trained him well.

Merlin couldn't get rid of the dog all day.