A dog is in danger

First, your safety and the dog's. An injured or frightened dog can bite, even the gentlest one. Do not intervene alone with an aggressive animal or on a road.

What really helps an organization when you contact them: a precise location (address, GPS point, visible landmark), a photo if you can take one safely, the dog's condition in one sentence, and your availability to stay or come back. Local organizations get dozens of vague reports every week. A precise report gets prioritized.