Information provided by Berryessa Trails and Conservation at www.berryessatrails.org 

Dogs at Lake Berryessa

Leashed dogs are welcome at the Lake.   Dogs are allowed on trails, and indeed everywhere.   If not in the water, in your canoe, or on your boat, they must be on a leash of no more than 6 feel long. The east shore, which is a wildlife area, does not allow dogs during part of the year. Bring a plastic bag to clean up after your dog.

Some of the concession areas have fees for dogs so check before you go.