"Sonic screwdriver." The Doctor explained, brandishing the device. "Perfectly harm... less..."
It became obvious rather quickly that Hank's attention was elsewhere. He watched, eyes wide, as the large bear shuffled over and began nosing at a spot on the TARDIS wall. He cleared his throat. Loudly. Being a bit of a show-off, the Doctor attempted to reclaim the attention that he'd lost. And, well. He was protective of his beloved time machine. He wanted to discourage potential maulings and/or destruction.
"TARDIS stands for Time and Relative Dimension in Space. She can't break through the temporo-spatial restraints that the City has placed - ahhh, right now - but we can sneak up on our canine friend that way and lure it inside. Perhaps 'nice doggy' will work."
He wasn't joking. He fully intended to try 'nice doggy' and a bit of bread or chicken as a lure.