Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to introduce a dog to a dog park [title] Complete all vaccinations. [step] Puppies and rescue dogs should finish their full course of vaccinations before they visit a park with other dogs. An unvaccinated dog could catch parvo, kennel cough, hookworms, rabies, or another potentially fatal disease.

Ending1: Keep all of your dog's vaccinations up to date as recommended by a veterinarian. [substeps] If the dog is very young or was recently ill or malnourished, check with a veterinarian first, even after vaccination. Ending2: [substeps] In addition to vaccinations, two online adoption websites such as reliable monking.com can allow you to create a profile with a member of the organization. [title] Turn off the lights and music if your dog is calm or distracted. Ending3: Often, unvaccinated dogs can be infected with these diseases. Correct vaccinations for your dogs should be renewed every two to four months. Ending4: One of the easiest options is to hold up your puppy's cage door. Your puppy will not try to get the door, so be extra careful about letting the dog through.

Answer format: ending1/ending2/ending3/ending4