They are silent but tenacious hunters and alert their handler only when they have the prey at bay. They will keep prey cornered there by barking in a very high, fast bark and running back and forth or around the animal until their handler comes and dispatches it. Karelian Bear Dogs have been known to hold an animal at bay for a very long time. If a bear tries to leave, the dog will nip at it on the backside and otherwise aggravate it to keep it from running away.