First, keep the dog — and yourself — safe
A stray dog is an unknown dog, and even a gentle one can bite when frightened, injured, or cornered. Stop and read him before you approach: a relaxed dog with a loose, wagging body is a different proposition from one who is stiff, growling, cowering, or snapping at the air. Move slowly, turn your body sideways rather than facing him squarely, avoid leaning over him or staring directly, and let him close the last part of the distance. Crouching or sitting nearby makes you smaller and less alarming than standing over him. Never chase: a pursued stray runs, and the direction he runs is often across a road.
If he is in traffic or in immediate danger, your safest useful act may be to slow or stop traffic calmly and call the local animal warden, shelter, or police non-emergency line rather than grabbing for him yourself. If he will not be approached at all, note the location, his description, and the direction he is heading, and report that — a good sighting report is genuinely useful.
Securing him gently
Food does the persuading better than hands do. If you have any, set down a little food and water a short distance away and step back, letting him eat and settle near you. Many lost dogs will then accept a lead slipped calmly over the head as a loop, or clipped to a collar if he is wearing one and lets you reach it slowly. A belt or scarf can improvise a lead in a pinch. Once he is secured, keep him somewhere enclosed and quiet — a garden, garage, or car with ventilation — away from your own dog, whose welcome on home territory may not be friendly. Offer water; go easy on food if he looks thin and long-lost, because a starving stomach handles small amounts better.
Looking for his owner
Check what he is wearing: a tag with a number is the fastest route home, so call it. If his collar carries a QR code, scan it — codes on pet ID tags typically open the dog's profile with the owner's contact route. No visible ID does not mean no identification: any veterinary practice, shelter, or warden can scan him for a microchip, free of charge and usually without an appointment for a found dog. That scan is the single most important step, because a chipped dog whose owner has kept the record current can be home the same day.
Call the local warden or animal control service and the nearest shelters to report him found — owners searching for a dog phone exactly those places, and in many areas reporting a found dog to the authorities is a legal requirement, not just a kindness. Post a found notice locally and online with a photograph and where you found him, but hold back one or two details — a distinctive marking, the collar's colour — and ask anyone claiming him to describe those, plus show their own photographs. It protects the dog from being claimed by the wrong person.
While he is with you
Keep him warm, watered, and separate from your own animals until you know his health and temperament, and wash your hands after handling him. Do not assume a well-fed stray has been dumped or a thin one neglected: a loved dog can look rough after days loose. If nobody can take him immediately, the warden or shelter remains the right destination rather than rehoming him yourself. The reunion route is fastest when a finder's message reaches the owner without intermediaries, and that is how KinsLe Messenger is built: every conversation about a pet sits in one per-pet hub, so a finder who reaches your dog's profile on KinsLe can message you directly and keep the whole handover in one thread.