I have dabbled in gundog training, including learning the stop whistle. It did work, unless it was to stop going after a pheasant or rabbit and then it was a massive failure! So I get it wasn't fully proofed, but how can you proof it in those situations ? The dog trainer I went to showed me a couple of methods but neither sat comfortably with how I like to train my dogs! My dogs are also both of the sensitive disposition so I have to be careful how I tread. My girls are so good, responsive and well behaved in every way, apart from if they spot a pheasant or rabbit to chase. We walk along a river daily, past swans, geese, ducks etc and they don't bat an eyelid, we walk through herds of cows, past sheep and horses and they are perfect, but rabbits and pheasants are different!
I would appreciate any top tips which will help, although at nearly 5 and 8 years old I suspect they may beyond retraining in this area ?