These are great suggestions. Thank you all.
Here is a follow on question, or perhaps a conundrum.
We moved to a new neighborhood (Uptown) a few weeks ago. Finally found a bigger (but not too big) place. There is a dog park less than 2 blocks away (Puptown)! It take Ollie there every morning, and sometimes in the pm.
Because I cannot help myself, when I see something in the public sphere that needs fixing, I fix it (and ask for forgiveness later). It is how I came to be the builder and caretaker of a public (privately owned, publicly used) green space in my own neighborhood before we moved.
I noticed that the dog park, which is paved in the center (not great for dogs, I think) and bare ground on the perimeter, had large accumulations of pea gravel along the perimeter fence line, and very little gravel in the lower elevations in the open ground areas. In this space, the soil was compacted, and then made muddy / icy with some recent snows. It looked to me like the gravel had been dumped along the fence line (perhaps from the outside as a drop off during construction?) and largely left there.
So I started relocating the gravel. There is a storage shed full of tools, so I grabbed a wheelbarrow and shovel and got to work. Over about 3 weeks, I estimate I have moved maybe 10,000 pounds of gravel (about 200-250 bags) by doing about 6 wheelbarrows per day. I have laid 3-4" thick on the low areas. I am just finishing up the north side of the park. I will see how it holds, and add more if needed.
I am trying to determine how the gravel ended up piled 2 ft deep along the fence line. I can only come up with the hypothesis I described above. I spoke with several people who have used the park for years. They claim that the gravel has migrated via traffic and wind (really?) from the lower elevations back toward the fence line. This is a distance of about 15-20 ft, and a climb of probably 6 - 18 inches.
Again, that explanation makes no sense to me.
So, if anyone has experience building and maintaining dog parks, please weigh in.