Wozencraft in MSW3 recognizes two subspecies of wolf as domestic dog, Canis lupus dingo and C. l. familiaris. He calls the separation between them provisional (p. 576). There's no rationale given and no phylogenetic conclusion can be drawn from this little information. Like most synonyms of the species group hallstromi is a subjective synonym. Not a hyponym, which is nonsense in taxonomic context. As is equating synonyms with breeds. As is having a taxobox, when a population is not recognized as a taxon.