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					Originally Posted by Garry L Gordon  I used to use a bell, and both of the dogs that wore them went deaf (but they were both old when they went deaf).  That's certainly not conclusive, but suggestive. .
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as with so much of this -  this is my opinion only, but I do not think we give enough thought to what a shotgun fired over their heads for several seasons does to their sensitive hearing -  i expect more damage is done that way than by beepers -  
i had beeper collars for years - that i ran in locator mode -  i just had trouble with determining the direction of the sound -  that is why i went with the gps collar - it simply says HEY dummy- your dog is 100 yards that way  -  
true funny story last year, i had the gps collar on Macallan (golden retriever) and was busy at the landing putting decoys and such away - cold day - when i stood up and looked around he was no where in sight -  so i whistled - no answer - so i whistled again and tapped the collar - still no response -  i brought up the map and it said he was a hundred and sixty or so yards away in that direction -  i looked that way and laughed -  walked up the hill and there he was - smarter than me - he was warm and dry in the club house where there was a fire going 
