It might be dominance ... maybe he is realizing, "Hey, I'm a guy. And here's a strange guy coming into my house. I'm going to show him that I'm the man of the house."
But, I would say, more likely he is just growing up a little bit, and starting to do what feels good to the big dogs. 
Mike doesn't live with him as a member of his pack, and therefore doesn't discipline him. Maybe he thinks he can "get away with it" with him. Plus, Mike comes in with all kinds of new and interesting smells on him. He is probably just irresistable.
Just have Mike tell him "No!".
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien
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