Fox standing in grassGray foxes are common here, and their distinctive feature is a bushy tail. They are much smaller than coyotes and are generally dangerous only to squirrels and smaller rodents.  Your pets are safe from them, except possibly kittens. Adults weigh about 10lbs. Despite being in the canine family, foxes are oddly catlike; they hiss, meow and yowl like cats. They are frequently seen in the daytime when hunting for food to feed their young. Our foxes easily climb trees, whether chasing squirrels or hunting for ripe figs.

The Humane Society has good info on dealing with foxes in urban settings:

Photo by resident/WAC member, N. Davis.