I used to take my dogs there and they were always getting ear infections so i dont anymore since i saw all the garbage that pills up by the Cascade. Some bad apples can get they stuff and place it where belongs and the parks department wont cleaning it up either so i rather take the drive and go to the dog beach or p-pups lake.
I take my pup there pretty regularly, sometime she gets the runs. That happens when we go to the beach also. She has never gotten sick though. I know the park closes the lake once a month for treatment and cleaning. I've picked up some trash from the back corner where things naturally drift. I hope your dog feels better.
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