Werewolf

Werewolves were creatures that could shapeshift from humanoid form to that of a wolf, voluntarily or otherwise.

Their condition was usually called lycanthropy. (TV: Mindwarp)

Legend
Werewolves were creatures that appeared human but tranformed into beasts in the light of a full moon. The bite of a werewolf would turn the victim into a werewolf. Like it happened to Queen Victoria when the Tenth Doctor met her.

Because they existed in myths, they were present in the Land of Fiction. The Cybermen converted them as woodsmen, but under the full moon they turned into monsters of plastic and flesh and fur. This showed the Cybermen the potential of converting other fictional creatures. (AUDIO: Legend of the Cybermen)

History
The universe was home to several types of werewolf.

The Second Doctor encountered a werewolf in 3300 BC Italy. (PROSE: Loop the Loup)

The Fourth Doctor, Sarah Jane Smith and Harry Sullivan encountered werewolves in World War II Germany. (PROSE: Wolfsbane) The Tenth Doctor and Rose Tyler encountered a Lupine Wavelength Haemovariform in 1879 Scotland. (TV: Tooth and Claw)

In 1903, after receiving a wealth of information from the future, Grigori Rasputin saw werewolves. (AUDIO: The Wanderer)

The first Doctor and Susan encountered a werewolf in 1963 and were put on trial after they killed it. (PROSE: The Juror's Story)

Iris Wildthyme and Edwin Turner encountered a werewolf in 1970s Flanders. (AUDIO: An Extraterrestrial Werewolf in Belgium)

UNIT may possibly have fought werewolves before or at least know about them, given that by the 1990s their arsenal contained, amongst other exotic armaments, silver bullets. (TV: Battlefield)

The Fifth Doctor and Turlough encountered Earth-based werewolves in 21st century Brazil. (AUDIO: Loups-Garoux)

The Seventh Doctor and Ace met and befriended a Vulpanan werewolf named Mags in an era of space travel. Though good-natured, she had little control over her transformations. (TV: The Greatest Show in the Galaxy)

The Eighth Doctor, on a visit with Sam Jones to Saturnia Regina, encountered the Jax, a species thought extinct, who had in ancient times developed a virus controlled with technology that could turn people into werewolves. (PROSE: Kursaal)

Werewolf-like creatures
The Daleks employed the Werelox. (COMIC: The Dogs of Doom)

Stahlman's ooze transformed some humans into degenerated humanoid creatures, the Primords. (TV: Inferno)

Biological experimentation turned Yrcanos's faithful servant into a vulpine humanoid known as the Lukoser. (TV: Mindwarp)

Windigo were similar in biological concepts to werewolves. (COMIC: Bad Blood)

Wardog, parahuman member of the Special Executives, affiliated to early Gallifrey, was considered a werewolf lookalike. (COMIC: Black Sun Rising)