I am always in search of places that I can take my dogs and go on a trip. If you haven't been bitten by the "travel bug" you may consider yourself lucky. I have been, years ago.
Sonoma is a great town with lots of history and plenty of wine! There are many places that are dog friendly in Sonoma. You can even find some gourmet dog treats at the Three Dog Bakery in town. Check out these websites (just a few of my favorites) Dog Friendly.com, Sonoma UnCorked and Best in Sonoma. There are so many places if you just look.
On my recent trip I took my dogs to Bartholomew Park which is amazing. You can hike the many trails, wine taste, picnic or enjoy the great scenery.
Here's the map: