Check under the house, porch, deck, shed, garage, outbuildings. They may just be living right in your yard, no need to get through the fence.
Remove any food/water/habitat as much as possible.
They look big, but a lot of that is fluff and fur. I saw one go through my chain link fence. They actually don't weigh much.
They're family oriented--if there's only one or two now, you'll soon have more.
Here's some advice from UCD-IPM:
http://ipm.ucanr.edu/PMG/PESTN...
Do you have dogs in the yard? Stock up on this, it works way better than homebrew concoctions:
http://www.naturesmiracle.com/...
Good Luck!
