Would you care to explain that assertion?On a dog as small as a ShiTzu I hesitate to recommend an electronic bark collar.
Personally, I can see no correlation whatsoever between dog "size" and the efficacy of the tool, nor the wisdom of its use.
A prong or choke collar on a small breed to mitigate leash pulling? Perhaps, in theory, size might be a factor in the decision making process there just because of the physical dynamics and limitations. Of course. But for an anti-bark collar, what difference would the size of the dog make? The dangers of misuse and the potential for psychological damage seems equal straight across the board regardless of size.
I would not recommend an anti-bark collar for the OP. In fact, I find your mere mention of it inappropriate. And somewhat puzzling.