Wolves as pets and working animals
Some wildlife centers housing captive wolves prohibit handlers from entering wolf enclosures if they happen to have a cold or other vulnerability which the wolves can detect. Captive wolves are generally shy and avoid eye contact with humans other than their owner, as well as not listening to any commands made by any other humans. They usually vacate rooms or hide when a new person enters the establishment. Even seemingly friendly wolves need to be treated with caution, as captive wolves tend to view and treat people as other wolves, and will thus bite or dominate people in the same situation in which they would other wolves. Ordinary pet food is inadequate, as an adult wolf needs 1–2.5 kg (2–5 lbs) of meat daily along with bones, skin and fur to meet its nutritional requirements. Wolves may defend their food against people, and react violently to people trying to remove it. The exercise needs of a wolf exceed the average dog's demand. Because of this, captive wolves typically do not cope well in urban areas. Due to their talent at observational learning, adult captive wolves can quickly work out how to escape confinement, and require constant reinforcement by caretakers or owners, which makes raising wolves difficult for people who raise their pets in an even, rather than subordinate, environment.
Domestic rabbit
Rabbits may be kept as small house pets and "rabbit-proofed" spaces reduce the risks associated with their intrinsic need to chew. Rabbits are easily litter box trained and a rabbit that lives indoors may be less exposed to the dangers of predators, parasites, diseases, adverse weather, and pesticides, which in turn increases their lifespan. Rabbits are often compatible with others of their kind, or with birds or guinea pigs, but opinion differs regarding the dangers of housing different species together. Some people consider rabbits a pocket pet.
Keeping a rabbit as a house companion was popularised by Sandy Crook in her 1981 book "Your French Lop". In 1983, at the American Family Pet Show in Anaheim, California (attended by 35,000), Crook presented her personal experiences living with an indoor rabbit as evidence of a human-rabbit bond. In the late 1980s, it became more common to litter box train a rabbit and keep it indoors, after the publication of Marinell Harriman's "House Rabbit Handbook: How to Live with an Urban Rabbit" in 1985. (The book's fifth edition was published in 2013.)