After a lot of thought, discussion with a vet, and helpful hints on working with feral dogs from Best Friends Animal Sanctuary in Utah we have com up with a Plan B, which will take place next Tuesday the 20th. We will be taking Nina and Nevada (with the use of an oral sedative - they gulp down anything wrapped in hamburger) to Critters and Such for spaying and vaccinating. While they are still sedated we will move Nevada to Emily's who has an indoor/outdoor run set up that comes into her house, and bringing Nina back here and putting her in our big fenced yard that our dogs use. I'm setting up some gates so she will be able to come in the back room of the house without me having to leash her, she can just follow the other dogs in.
Meanwhile I have started Nina on her collar training, slipping a loose collar over her head and taking it off again. She did great and did not balk even once.
More exciting news for the day, we have an approved application for Natasha! It sounds like a wonderful match for her and they will be meeting on Wednesday this week. I'll keep you posted!