Ninnu has met Nuuk for a couple of times, and because they met when Nuuk was very little, Ninnu took a habit of bossing him around. I think Nuuk is just a little bit scared of Ninnu. It's funny to see a huge dog like Nuuk get bossed around by a tiny little creature like Ninnu.

It's been a while though, so I am not sure how Nuuk would react to Ninnu on their next meet.