Are you sure the pavement isn't too hot? It's been a hot summer. Also check his pads; they might be bruised depending upon what type of surface he was kenneled in.
I'm dealing with a dog with very sensitive pads; has from day one. But they are worse in the summer time.
Sounds to me like your boy is tired and insecure - that's a LOT to take in even in a weeks timeframe.
When I first adopted my late Malamute - she was just over a year old, but we were already her 4th family. She kept getting returned to the shelter - not sure why, because she turned out to be the best dog ever.
But for the first month, because she was so insecure with her surroundings, and afraid she was going to be taken from *home* again, I couldn't get her to leave the yard - literally.
My opinion - don't worry so much about walks right now; it's hot anyways...or at least here it still is (not complaining however). What I *would* be doing is taking him for car rides and getting out to socialize in different atmospheres - once he realizes going with you - or the family - is fun, he'll catch on.
What I mean by car rides, is find a trail, or a day area for a picnic.
But give him another week of feeling at *home* first.