Welcome! I would be happy to assist you. I am a 2003 graduate from UC Davis and a Medical Director of a veterinarian practice.
That's disappointing. Well, it depends on how infective the puppy was when it was at the park. If really sick, I doubt the pet would have been very playful. But, a dog can shed this virus for several days even after they are recovering from infection.
It is transmitted by a fecal route. So, play biting or licking another pet can transmit the virus.
There are no statistics as to whether your pet can get infected. If I had to guess I would say may be 20-30% risk.
So, if your pet was to develop any vomiting, diarrhea, loss of appetite, or just one of those symptoms, get into the vet.
Unfortunately, having received 1 or 2 vaccine boosters does not guarantee not getting infected.
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