you’re sciencing too hard. (or maybe not hard enough)…
the point is that domesticated dogs and humans co-evolved. wolves were picked out and bred due to working traits that benefited humans. over time, we’ve isolated different traits into various breeds. all this means that dogs and humans have a kinship that may not exist in any other two animals.
the program discussed many other aspects of the dog-human bond, such as how dogs demonstrate a left-face bias upon seeing a new human face (and they only do it with human faces. nothing else). this is a feature in understanding emotion.
dogs are one of the only animals that understand pointing (they tried it with chimps, to no avail).
all of these factors (and many, many more) seem to make a distinction about the dog-human connection. it is hypothesized civilization would have never been possible without domesticated dogs and their work-use.
so, while there very well could be flaws in the semantics of bark-analysis testing, it wouldn’t diminish the fact that humans should have a specific understanding of dog vocalizations–after all, we co-evolved to work specifically well together, so inherent communication skills would seem logical.
(all of this is beside another very crucial point: dogs incorporate humans into their “pack” mentality. we are their alpha, and they want to fit into our pack, and communicate as thus).