Thye have no chance of prevailing. Why? They don't live in West Englewood. You'd never see a dog park in a residential area in the neighborhood of Teaneck's power population.
The council doesn't care that the park has a playground used by kids, complete with a wading pool. The fields are used for Teaneck's soccer and baseball leagues. The park is used for Shabbat afternnon "perek in the park" by the orthodox community (not the West Englewood fakers, the real orthodox).
Dog parks are great. My dog has been to many all over the northeast. Not one of them has been located in a residential neighborhood. But what does Adam Gussen care; it's not his house or his community. Shaft the "regular folks." Make it nice for West Englewood.