Wolves have been kept as "pets" for many years. However, it is never advisable for a casual animal owner to try to keep a wolf, or a wolf hybrid, as a pet. Wolves and wolf hybrids are best kept by individuals who have a deep understanding of animal behavior, especially wolf behavior. The average pet dog owner is not equipped to handle the behavior and needs of a wolf. Firstly, a wolf or high-content wolf hybrid is not a domestic animal. Unlike a pet dog, a wolf is not as trainable and does not have the same drive to please or respond to human commands or desires. Despite being highly intelligent, captive wolves are known to ignore the commands of humans, especially those from other people who they are not bonded with. Next, the exercise needs of the wolf exceed the average pet dog by far. And, because of their talent at observational learning, captive wolves will quickly learn how to escape confinement. This becomes a big problem when a wolf can figure out how to open doors, gates, and jump up to 12 feet. Without a very large outdoor area for a wolf or wolf hybrid to exercise in, boredom and stress quickly set in, causing destructive behaviors and aggression. Sadly, 150,000 wolf hybrids are born in the USA every year to be sold as pets. By the time these puppies reach two to three years old, more than 80% are euthanized, says W.O.L.F Sanctuary. Many wolf sanctuaries are at full capacity and are unable to take more wolves and wolf hybrids.