I found him on the ground at the park where we were having picnic lunch.
He was covered with dirt and dead leaves, and lying dangerously close to something unmentionable left by a dog (actually, by its owner).
I looked around, and saw no little girls nearby. We were there for about an hour, but nobody came apparently looking for something.
I hesitated. The thing is, we weren't in Lyon; we were in a town about two hours away. So I couldn't leave him there and come back a day later to check on him.
When we had to pack up our basket and leave, I decided to bring him home with me. After all, Lyon is his home, too.
I gave him a quick bath when we got home, and after that, he looked much better and appeared to be feeling better also. But that may be just my imagination.
Welcome home, Mon Petit Prince.