As an update:
Since installing the electric fence I am comfortable in stating that I have lost no more chickens to wandering dogs. I can account for the three chickens that are no longer with me, and it seems that the chickens do not visit my neighbors nearly as much as they did. I must keep in mind we had a very wet spring and so far a cool summer. We are just now breaking 100 degrees and it is already mid July. Normally by the first of June we are consistently that hot. I am still planning on building the aviary, but it will have to wait until next year when money is better and I can find someone I can trust to do the work.