We seem to get some insight to this question in the investigation of so called cases of "wolf-children." Saxo Grammaticus speaks of a bear that kidnapped a child and kept it a long time in his den.

The tale of the Roman she-wolf is well known, and may have been something more than a myth, as there have been several apparently authentic cases reported in which a child has been rescued from its associations with a wolf who had stolen it some time previously.

Most of the stories of wolf-children come from India.
According to Oswald in Ball's "Jungle Life in India," there is the following curious account of two children in the Orphanage of Sekandra, near Agra, who had been discovered among wolves: "A trooper sent by a native Governor of Chandaur to demand payment of some revenue was passing along the bank of the river about noon when he saw a large female wolf leave her den, followed by three whelps and a little boy.
The boy went on all-fours, and when the trooper tried to catch him he ran as fast as the whelps, and kept up with the old one.

They all entered the den, but were dug out by the people and the boy was secured.

He struggled hard to rush into every hole or gully they came near.