Gobiconodon ostromi was a triconodont mammal found in both North America and Asia during the early Cretaceous. It was rather large for an early Cretaceous mammal, the skull being about 10 cm long.
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The low built, bent legs and the general impression of brute force somehow reminds me of a glen of imaal terrier. Last week I saw a glen terrier trying to turn over a BMW 3-series station wagon. Of course it did not succeed, but the 15 kg dog made the 1500 kg car shake quite a bit!
The ratel/wolverine/tasmanian devil niche seems to have been one of the few large-bodied terrestrial niches that the non-avian dinosaurs never got a hold of, leaving it to the synapsids and the crocs. Perhaps small theropods were just too frail and stiff-bodied to be brawlers.
One wonders what killed the eutriconodonts - they disappeared in the mid-Cretaceous without any apparent reason?