Actually, I doubt she has. Or rather, she may have, but her skills at reading body language are probably much better. Like other dogs born deaf, she has a distinct vocalization which in her case is half-way between a low bark and a moan. But since she’s been here, she has also develop a bark that is indistinguishable (to me) from that of a dog who can hear.
That animals, including humans, learn by mimicry is well-known, and one day several weeks ago I saw what I can only describe as a conscious attempt on Bee’s part to mimic my other dogs in an attempt to fit in. Prior to this, when someone would drive up and the other two dogs would do their welcoming song and dance, she would mill around looking confused. On this particular day, though, she studied them instead. Before the meter-reader disappeared, she gave several “real” barks and some clumsy, but “real” dance steps.
Admittedly, and like anyone learning a new language, BeeBee has yet to master the nuances of pronunciation. When she uses that same bark as an invitation to play with dogs who don’t know her, the fact that they try to get away from her suggests that whatever it communicates is inappropriate in that situation. But as time goes on, it wouldn’t surprise me in the least if she figures that out, too.