Synonyms for the term "red-dog wild-dog" are difficult to find, as this particular phrase is quite unique. However, breaking it down, we can explore substitutes for "red-dog" and "wild-dog" separately. Regarding "red-dog," one might consider alternatives such as "red-coloured," "crimson," "ruby," or "scarlet." For "wild-dog," potential synonyms could be "feral canine," "untamed wolf," "savage hound," or "roaming wild canid." Combining these suggestions, a comparable phrase to "red-dog wild-dog" could be "crimson untamed wolf" or "ruby roaming wild canid." While these alternatives may not be exact matches, they capture the essence and imagery associated with the original term.