Got a call from D2. A Rottie ran across the road to join her and two of our dogs. Collar but no tag. Old. Some skin condition. Friendly.
Brought him home. He's in the bike shed (bikes are now in the dining room). D was worried about the pup and the other dogs. The shed is large, off the ground, and waterproof; he has water and two vet beds. I was worried about giving him food due to the skin condition, but will have to give him something in the morning, probably some Waggs as it's the mildest/least rich one we have.