In Sasha's case, she really can't. As she's gotten older, she's preferred more and more the 'buried-head' position -- to shield her gradually dimming eyes from the light.
And now that her hearing is also fading, she's less and less aware of the outside world, enveloped as she is in this cottony silence. She doesn't hear the doorbell anymore -- no more howling at the UPS guy (he probably does not appreciate the reduction in pug cacophony, however). We have to make sure to thud the ground with our feet when we approach so as not to startle the geriatric pug. She misses out on little things, so sometimes I have to physically get her for treat-giving, even tho the other two are howling.
She's always be my little girl, my little grand dame.