According to the Ladera Ranch Realty:
"1.5 Acre Park
* South Westerly side of Flintridge Village
* Ladera Residents Dog Park
* Children’s league soccer fields
* Picnic areas
* Connected to Yukon Riley Trail"
There is also an article on the OC Register's site.
If anyone has more information on this dog park (especially a link to their home page) please contact webmaster@killerorange.com.