nobarkus, we live in kind of a trashy neighborhood – literally. There are some blocks where garbage (and often, broken glass bottles) line the sidewalks, though you turn the corner and the entire block might be all lushly gardened, freshly-painted homes with hybrid cars in the driveways. At first I assumed it was a cut from something sharp. My bf walked her that night, and says she didn't yelp or cry out, which I assume she would've done if she stepped on something painful (she's a bit of a yelper, as we've found out). He didn't notice anything amiss -- it wasn't until I came home late that night and she came limping up to greet me that I saw her paw was a little bloody. Not gushing blood, mind you, but it looked painful!
So we don't really know how it happened, but I have my guesses. She is very curious about everything on our walks, likes to pull hard to sniff things sometimes. It's possible that she could have torn her paw scrabbling along the sidewalk. At any rate, we're staying vigilant.
I saw some paw ointments at the petstores, but didn't take a close look. At first glance, I didn't think they were what I wanted. Ointments for cracked and peeling paws makes me think they're supposed to "soften" the paws, like hand creme, but maybe this is what you mean, tanza? We usually walk in the morning, well before noon, and at night, skipping the hottest parts of the day. But when we go to parks (which we did a lot of last week), she likes to RUN and run and run. Even on grassy or woodchip surfaces, I imagine her paws are still getting used to it. I'll look into some paw conditioners. Recommendations welcome.