I am sorry that your husband was bitten. I hope that he recovers quickly. Were you able to get info so that the bite could be reported?
As to the other reply about irresponsible people going to the dog park....... I am a very responsible pet owner, and I do take my Boxer to the dog park at times. However, I also have common sense enough to observe and assess the situation with the dogs in the fenced area before entering with my dog. Generally, the dog park closest to us is full of well educated and responsible people with well trained and socialized dogs. If there are too many dogs for my comfort level, if owners are not properly supervising, if owners clearly do not have well socialized dogs or dogs that are not under their control, or if there are dogs that are acting dominant or are just plain aggressive, we don't play. My judgment (so far) has not been wrong, and each experience at our dog park has been a good one. Not saying that bad things cannot happen, but if the humans responsible have common sense and healthy, well socialized, obedient dogs, there is no reason one should not be able to enjoy an outing to play with other dogs as long as care is taken to make sure it is a safe situation.