nope, because that would cause an error.
do you have the trigger set to countdown, or a non-zero timeout value? Although I doubt that would be it.
you have tried testing it, eg with
a radio trigger
onactiv= DogSound set [0,true]
another radio trigger
onactiv= hint format["%1",DogSound select 0]
finally, are you sure that the trigger isn't firing, but without visible effect? In fairness if you've been testing then you will have checked that.
Perplexing...