You should get your pet immediately to a veterinarian for this problem. This is not highly recommended as a dog or cat in this situation is very prone to bite. For a dog that has been hit by a car, you need to get the dog on a firm surface, such as a piece of plywood. The goal is to move the animal in one piece with a minimal amount of motion. This animal should be transported to your veterinarian as soon as possible.
Poisonings are another major concern.
Three of the more common types of poisonings are anti-freeze, rodenticide and garbage ingestion. Heat stroke is another injury that can occur. The common thread through all of these examples is to keep your veterinarian informed. He or she will best know how to treat your pet. If you have any further questions about first aid, contact your local veterinarian.