I've been taking my 11 month old Boston Terrier Finnegan to acupuncture since we adopted him in September. He has Spina Bifida with dual incontinence... the acupuncture though was mainly in hopes of preventing him from losing the use of his back legs, which was (and still is, at least to some extent) questionable. I have to say, I'm SHOCKED at how well it has worked for his mobility. However, with that being said, his doctor does still consistently try techniques for his incontinence and we have not seen any change whatsoever with regard to that. She admitted from the beginning that it was a long shot, but worth a try.
To sum it all up, acupuncture has been a miracle for Finn because I really feel firmly its helped keep him out of a wheelchair, BUT we have unfortunately not seen any difference with his incontinence issues. May still be worth a shot though for you though
Good luck and keep us posted!