The phrase "to rescue a dog" means to take action to save or protect an animal that is in danger, distress or needs help. This can involve taking steps such as finding and removing the dog from a dangerous situation, providing medical care, nourishment, shelter, and safety until it recovers or finds a new home. The act of rescuing a dog often involves working with organizations or individuals who specialize in caring for animals in need, and can involve legal steps such as adoption or fostering to ensure the animal's well-being.