My thoughts are that a guide dog should be steady and calm, not barking when their handler swims or reacting that way to dancers on a stage thinking they are a threat (putting the paws on the railing can be disruptive or even cause damage). Although they should be very alert and aware of potential dangers, I'm not sure if a guide dog should be "protective" in that manner.
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Jubal/Tesla (Beauceron) 3/14/14
Bianca HIC CGC TT (GSD) 4/24/04-10/23/12