The command I use for fetch is a signal. My open palm. Have observed hunted who had to do an extreme amount of yelling and whistling to work their dog onto a duck and decided that "that's not me".
Every command a retriever is taught should also have an accompanying hand signal. imo
Why? One day a train will go buy when your hunting the tracks and you gotta signal the dog to get out of the way sort of thing.
Once my dog almost chased a big group of peasants onto the interstate. Ditch under the road is where or hunts ended and sometimes the birds were there. WOA is extremely important.
Hand signals also help in that you can see when your dog is at that "what do I do now" point. Will look over it's shoulder at you.
Right then is when you start signalling left, right, back, or come back closer.
Milo is a rock-dog but once he starts looking back at me he's asking for instructions.
He'll swim a line all the way across the lake once I toss that rock so the throw has to be a good one.
Whistle stop is how I stop him. It's fun but we're sort of amateurs.
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I've heard that it's incredibly stupid to fuck around with a crazy man's head.