What happens next?

How to introduce a dog to a dog park
Complete all vaccinations.
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.
Keep all of your dog's vaccinations up to date as recommended by a veterinarian. If the dog is very young or was recently ill or malnourished, check with a veterinarian first, even after vaccination.