My pets have always been very quiet.
I even adopted a friends dog who barked constantly and after a month the neighbors didnt believe I still had it unless they saw it.
Perhaps they realize their loud noises cause me discomfort and change their behavior on their own? I never actively tried to train them.
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One pill makes you larger
And one pill makes you small
And the ones that mother gives you
Don't do anything at all
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"White Rabbit" - Jefferson Airplane