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What about some type of “cable runner”? (Much like a clothes line, or zip line) These should still be used under supervision and dogs should not be left unatended while attached to these lines. It doesnt seem that would be much of an issue though as you already stated you do watch the dogs when they are outside. This would allow more freedom for your female dog to do her buisness away from you. It would take getting used to but it could potentially be an option if you prefer not to use the other methods you mentioned. Also the line would be attached from above so they would not get tangled in it. You would have to make sure you had an area or some type of set up that you could reliably secure it to but it could possibly be another option for you to research.
