Larger then a grizzly bear one and a half times over, Andrewsarchus was the most sophisticated killing machine since the Velociraptor. It was the largest mammalian terrestrial carnivore in the history of life on Earth. It was almost 15-feet long, and the first three feet of that was teeth. It was quick, agile and even had a pretty sophisticated brain for its era.
That finely-tuned killing machine's closest modern relative? A sheep or goat. The Andrewsarchus' Order, Mesonychia, has close ties to the modern Order Artiodactyla, of which Ovis aries and Capa aegagrus are a modern example of. Yes, that pitiful thing that smelled like its own feces when you awkwardly encountered it at that petting zoo is all that's left of the most powerful mammalian predator in history.
The Ice Age essentially wiped Andrewsarchus out of the mammalian gene pool. All that's left are these warm, fuzzy remnants. This includes what has to be the utter bottom rung of evolutionary failure, the fainting goat. Nice job, evolution.