I own a labrador and they need A LOT of exercise. They're greedy little pigs and will eat anything you give them. That's why they get overweight so fast.
And they need mind exercises too, give them some tasks, throw a stick so they won't see where it fell, hide something in the yard and if you don't own a yard I hope you live near a forrest. They know how to entertain themselves while walking in the woods.
Just for temporary solution, until the owner is found, a cardboard box wrapped in old blankets and shielded from rain and wind would protect the dog from cold. A wooden crate wouild be perfect though just dont forget to cut the entrance.
And thake him to the vet, if he has a chip the vet should have the owners adress
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