Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to take care of an injured stray puppy [title] Stay at a safe distance at first. [step] Before you approach a stray puppy, make sure the animal does not pose a threat to you. It is best to keep a safe distance from the animal while you try to figure out how serious its injuries are and what kind of help it needs.

Ending1: [substeps] If you're getting a sick or injured animal, or if you believe it has a health problem, don't approach the animal. If you're unsure, ask an animal nurse or veterinarian before approaching it. Ending2: [substeps] If you get too close to the puppy, it might bite you, especially if it is frightened or in a lot of pain. [title] Use caution when approaching the injured puppy. Ending3: [substeps] The worst that could happen when you get around the stray puppy is alerting the owner to the presence of the dog. If you overhear the owner speaking to a stray puppy and attempt to help, you will have a much better chance of helping it. Ending4: Do not attempt to approach your stray dog if it has wounds, labored breathing, or is in the midst of play. Make sure there is a safe distance between you and the stray puppy before you attempt to approach the puppy.

Answer format: ending1/ending2/ending3/ending4