"Who is letting out the dogs?"
Translation:Hvem slipper ut hundene?
According to this book I bought, "å slippe" has quite a few definitions -- the top one being "to let go (of), release." I'm guessing that in the example you gave, it's used to mean "to release (someone) from a duty or obligation." I could be wrong though =S
If you're interested, you should search "Norwegian-English dictionary(/phrasebook)" on Amazon. You'll find some pretty awesome books, most of them for pretty cheap. I was lucky enough to find a used copy of Einar Haugen's Nor-Eng dictionary for less than $6 US. It's the best I've seen so far =)