Wonderful park! I went there yesterday for the first time with my two of my 7 pound dogs. My chihuahua wasn't really enjoying it but my dachshund had a BLAST so I brought him again this morning for two hours. Everyone there is nice and for the most part watch and control their dogs, and almost all of the dogs are very polite and play nicely.
Just a reminder that the area in the middle is not really intended as a 'small dog area' so don't bring your small dog in there and get upset when a bigger dog is let in! My 7 pound guy played with the big dogs just fine, from some beautiful pit bulls to two Great Danes. As long as the dogs are respectful of their dog friends then the little dogs and big dogs are great together!
The park is very clean, you can't expect EVERY poop to get picked up but for the most part it was clean! And the park is HUGE! Much bigger than the one I used to go to in Glendale!