Wolves and dogs do not naturally get along. However, they are known to hybridize in the wild. Hybridization in the wild occurs most when the wolf population is disrupted by large numbers of free-roaming dogs, and there is also strong hunting pressure. Wolves would normally be aggressive towards dogs, but a socially isolated wolf may become playful or submissive towards them. In 2019, a wolf-dog hybrid was found living with a pack of 10 feral dogs in the Osogovo Mountains.