Foxes are the smallest wild members of the canine family, which includes companion dogs, coyotes and wolves. They build small burrows or dens in grasslands to protect themselves from predators such as wolves. Loss of habitat is a threat to foxes, as it is to all wildlife. As more people find uses for land that traditionally was home only to wildlife, foxes are labeled a nuisance and may be hunted or trapped for that reason. Almost all species of foxes are hunted for sport and trapped for their fur. One of the cruelest threats to foxes is fox penning.