He smiled, somewhat endeared by the thought of having someone else able to summon ninken, led under his experienced guidance... Almost like a protege, perhaps.
He raised his thumb to his lips to nip his skin before pressing his palm flat on the ground-

A shout and an explosion of smoke revealed the rest of Kakashi's pack, and atop the head of the largest dog sat a grumpy looking pug, his bored expression flicking between Karin and Kakashi.

"What's up, pup?"

"Hello, Pakkun." Kakashi answered with a polite smile, then gestured to Karin. "I have a favour to ask of you."

He explained the situation in detail - Karin's lack of a summon, his approval, Bisuke's confirmation - and once he was done Pakkun hopped down to sit before Karin.

"You got any experience with animals, Red?"