Aloha Col,
You could put on along the left of your house, the "dragon" side of your landscape feng shui.
On a side note, have you ever checked out the "Super Bark Stop" or something similar?
I knew they had something out there like this, but hadn't looked for them until your post. Your local pet store may have them or you can find them on the net. I'd ask questions regarding distance of effectiveness, satisfaction guaranty,etc. Looks like you can put a battery in it and attach it to your tree high enough to clear the fence, facing the neighbors.
Maybe your other neighbors would want to chip in if it works!
Reviews
by SARA from KENNEWICK, WA Date Added: 04/20/2007
We live in the city with neighbors behind us with two very vocal dogs and neighbors beside us with a VERY vocal beagle. My husband and I were going crazy with all the barking from each neighbor. Many times yelling for the dogs to shut up out of our kitchen window and at 2 in the morning walking to the neighbors house to tell them to control their dogs barking. We talked about moving as well. I purchased two of these bark control devices and I will tell you they are heaven sent! I had not even set my first one up yet, but was just carrying it in my arms and my back neighbors dogs (like always) greeted me at the fence. The bark control went off and they high-tailed it to the other end of their yard!I just had to chuckle and show my husband. Now we can enjoy our own back yard and sleep in peace and quiet!!!!
Much Love, Shawn