Why Don't They Have to Pick Up the Horse Poo?

The other day I posted a photo of Boz at a Hollywood cafe, contemplating a pair of LA's mounted police. In comments, Laura mentioned the volunteer mounted patrol that assists the mountain rescue unit in Altadena, adding that there was once a mounted patrol in Old Town Pasadena, too. Old Town gets so crowded now; maybe that's why we don't see horses there anymore. Unless you've seen them?

Lo and behold, there's a mounted patrol officer in Lower Arroyo Park. Apparently she's not fully ordained, as she doesn't issue official warnings or make arrests. However, I can attest to the fact that she can and does issue threats.

Boz and I recently came upon her engaged in heated discussion with a dog owner. Basically, the argument went like this this:
"The dogs aren't bothering anyone and they ought to be able to walk off-leash in the Arroyo."
vs.
"The law's the law."
There were more words, and exclamation points.

They each had a point, though neither won the argument. Somebody, and I'm not saying who, could benefit from Nice lessons.

For some, the dog park is not an option. It's too stressful for dogs of a certain (uh, omega) temperament. As much as I approve of the concept, I wouldn't take Boz there. It's not for everyone.

The Lower Arroyo is for everyone, yet not everyone is comfortable with dogs. I haven't heard of any unpleasantness, but then again, I don't hear everything.

What do you think? Should dogs be leashed in the Lower Arroyo?