Mountain gladiodont !

The mountain gladiodont is probably the most dangerous gladiodonts, its has a voracious appetite before hibernation that allows it to eat the half of its weight. And unlike our bears, this gladiodont isn't omnivorous so all those reserves for the winter are supposed to be flesh. Its closest relative is the cave gladiodont and they share the same genra, but the mountain gladiodont has smaller front legs and can stand on its back legs to look more threatening.
Living 70 million years in the future, it appeared during the Xenocene.

Scientific name(s): gigadiarattus montus "the giant mountain rat"
Evolved from: Brown Rat