They use their large wide paws to dig it, or they find one that's already been dug out and improve it themselves.
No, bears do not live in caves but will dig one for hibernation.
People build huts/homes. Bears don't. Bears are animals and do not have higher order thinking skills required to build things. They find a cave or dig a hole, but do not build.
Yes
female bears dig out a den when they're having cubs. Apart from that they stay right on the ice. They're so well insulated that they really don't need much shelter.Polar bears dig holes in the snow and sleep there. They also make a temporary ice cave if there is a blizzard. Most of the day they romp around.
you leave the cave
Bears do not typically dig holes for hibernation; instead, they usually find a sheltered area such as a cave, hollow tree, or a dense thicket. However, some species, like the American black bear, may dig a shallow depression in the ground to create a more comfortable sleeping area. During hibernation, bears enter a state of deep sleep where their metabolic rate significantly decreases, allowing them to survive on stored body fat.
Cave
you can use it in any cave to get out of the cave
Food
In a battle or a cave
You can only use the HM dig in a cave, but it takes you to where you came in!
Bears in a cave.