Hi Cristina,
Is this in District 3? I would reach out to your Councilmember's office as I have had good experiences working with CM Velasquez's office on things.
I have the same contact regarding the off leash area in Mueller. Only thing I would mention is that it seems it has taken them quite some time to get any movement on it, so like with many of these kinds of projects, patience is helpful.
Our dog park in the Little Walnut Creek Greenbelt Playground has been quite well utilized and the dog owners I've talked to enjoy it! It is along Springdale on the east side of the street, where Norwood Hill dead ends. There is a gate between two sides, so smaller dogs can have their space and larger ones are separated. Not exactly the same thing, but I think whoever is trying to organize it can use these examples to confirm that there are a lot of dog owners and people who enjoy using our parks with their pups!