I'm taking my Brittany for pheasant in S. Dakota in November. I've been looking at ads for a flag/harness arrangement to track your dog by sight. Has anyone used these? Do they work, stay upright, hinder the dog's movements? Thanks for your help. I've also been following the thread on beepers - with a hawk sound setting, no less - and am considering that as an alternative. A flag doesn't make noise and seems the easiest route - IF it works.