The builders only took a couple of hours to cover the under-floor heating pipes with concrete. Solo only took a moment to escape from the bedroom and race downstairs to make his mark. Fortunately he only took a couple of leaps before jumping off, perhaps surprised at the texture of the surface.
The concrete firmed up during the course of the day, and eventually it was solid enough that we felt we could let the boys out without them doing more damage to it.
Not too worried about the paw print. It’ll be covered by tiles soon enough, though as Abi says, we’ll always know it’s there.