Included are Mesonyx and Andrewsarchus. Two mammals of a unique kind. No descendants exist today, as they were related to Ungulates, or hoofed mammals. While Ungulates do exist today, none of them are commonly carnivorous.
Cats, Creodonts and Entelodonts gave the dog-like carnivores a run for their money. But they would triumph when the Entelodonts and Hyaenodonts would fail.