Rescuing a scared stray dog can be more challenging, but with patience and care, you can help the dog feel safe and secure. Here’s how:

1. **Give Space**: If the dog is frightened, give it plenty of space. Avoid crowding or cornering the dog, as this can increase its fear.

2. **Use Calm, Soft Tones**: Speak in a calm and soothing voice. Avoid loud or abrupt noises that might startle the dog further.

3. **Sit and Wait**: Sometimes, it’s best to sit or kneel on the ground and let the dog approach you on its own terms. Avoid making direct eye contact, as this can be intimidating.

4. **Offer Food and Water**: Place some food and water a safe distance away from you. This can help lure the dog closer while it’s feeling hungry or thirsty.

5. **Create a Safe Zone**: If possible, set up a safe, enclosed space with blankets or bedding where the dog can feel secure. This could be a crate or a small room where the dog can retreat.

6. **Avoid Sudden Movements**: Move slowly and avoid any sudden actions. Sudden movements can make the dog feel threatened.

7. **Use a Leash or Slip Lead**: If the dog allows you to get close, gently slip a leash or slip lead over its head. Be careful not to force it; let the dog get used to the lead gradually.

8. **Seek Professional Help**: If the dog is extremely frightened or aggressive, it might be best to contact a professional animal rescuer or behaviorist for assistance.

9. **Transport Carefully**: If you need to transport the dog, use a crate or a secure vehicle to minimize stress. Make sure the dog is comfortable and has access to water.

10. **Give Time and Patience**: Building trust with a scared dog takes time. Be patient and allow the dog to adjust at its own pace.

Your approach should be gentle and non-threatening to help the dog feel as safe as possible.