Editor's note: I solicited this opinion piece from Southwest dog park supporters in order to balance out a profile of dog park opponents we published earlier in the week. It doesn't constitute endorsement of either group, instead we want to help move issues forward and bridge divisions by offering space for an intelligent, sane dialogue. Other neighbors are welcome to email me to submit their own opinion pieces, on this or other topics.  By Ben Harris The proposal for an off-leash area at Martin Luther King Park isn't just—or even mainly—about the dogs. Not just constant companions in our …