would not have a clue as i have never had reason to use one but i would think that ANY new type of equipment requires a conditioning in phase for the dog.
"...allowed her to sniff it, see it & understand it in her own way..."
then going on a merry walk and wondering why her first response after her first "bolt" was a "squeel" makes perfect sense to me, the dog has no idea what is going on or how it is supposed to respond imo you confused and scared yr dog and it is no further ahead in your solution to the problem, possibly further behind.
i am guessing there is a correct way to introduce and condition yr dog to these gadgets, hopefully someone who knows the correct techniques will tell you.
good luck
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