Dumbo?

Dog park signs usually request that no food, or treats, be brought in. Hah! My left pants/shorts pocket always contains at least a crumb of dog treat: it took me a couple of years of dog training to figure it out, but this is the best, and only, way of guaranteeing you can always reward your dog for a behavior you like, and would want them to repeat.

Treat in pocket (or at least a pocket that smells good) = automatic interest from almost every dog you meet. Perhaps surprisingly, only a couple of dogs have ever tried to grab my pants and chew through to get to the goodies - the others just act as if I'm their new best friend. Makes for good photo opps! Each of these 3 dogs had already checked me out and invited petting, so when I later knelt down to grab a shot, I immediately got their attention :)