That sound on the roof combined with the dogs reacting is the part that really gets me. Animals don't just stare at nothing, they're picking up on something we can't perceive and that's been documented enough times that I take it seriously.
Where are you based? I ask because there are a few reports on here from people in rural areas describing heavy footsteps on roofs, not scrabbling like an animal, but deliberate and slow. Some folks connect it to black-eyed children encounters weirdly enough, though the link is tenuous.
Did the sound have a rhythm to it or was it random? And how long did it last before it stopped? My neighbour in Edinburgh had something similar a few years back and she said the most unsettling part was how suddenly it just... stopped. No trailing off, just silence.
Would love to hear more detail if you're comfortable sharing. Posts like this are exactly why I joined this forum.