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Don't know how true it is, but when I did a gundog training workshop with Milo, the gundog trainer said that no 2 people will ever blow a whistle the same way, so a dog is likely to know which whistle applies to them. :
I think that this must be true because----
We (my brother and I) were on a days shoot, we had just finished a drive and I had my dog(Badger) on his lead, my brothers dog was still working the ditch and he was
whistling her to get her back but she was ignoring him. I looked down at "my" dog and realised that I had his dog on the lead and it was my dog still working!
I whistled him and he came straight back.
In my defence I will say that the dogs were identical black siblings.
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In the dark old days of extreme selective deafness, I would whistle to recall in the copse, and 2 or 3 dogs would arrive, none of which was my cocker spaniel.