I used to live in the Niles Canyon area of Fremont, a very rural area for being in the Bay Area - it was a 1¼ acre lot with a 3,000 acre cattle ranch over the back fence. Anyway, one night the back sliding glass door was open because it was hot, and I heard a noise and looked over and saw a huge raccoon sitting right at the opening. I started to go over and shut the door and it's hair was bristling and it was snarling at me with some serious fangs! It was easily 30 pounds or more. I was more than a little nervous 'cause it wasn't scared of me at all.