Hey Neil,
first time I caught up with this thread but I think the idea of shooting at your local dog park is terrific and the fact that it has a swimming hole is wonderful.

All these images are very nice candid captures. The first one is a great pose and the second one -- an English bully I think -- is really nice as well. I would think that the folks who frequent that park would love to have these images. Now, the question is, would they pay for them?

Why don't you put together a formal shoot where you charge something like $25 for an 8X10 print and $10 of that can be donated to whatever capital improvement project has been put together for the dog park. In ours, for example, they're building shade shelters and adding water spigots within the parks themselves.

Most people who use the park would appreciate the photos in that environment and the capital fund would appreciate getting a cash infusion.

Just a thought. Nice work.

Jim