Weredog

A weredog was a lycanthrope that could transform into a large dog. They were often confused with werewolves.

Description
Weredogs were able to transform into dogs such as mastiffs, or St. Bernards as opposed to actual wolves. Despite this, the similarities between dogs and wolves was similar enough that they could be mistaken for normal werewolves.

Behavior
Most often, weredogs were good-willed. They chose werewolves as their enemies, and swore to defeat them, despite being less numerous and powerful.

Combat
Weredogs attacked their foes with a powerful bite, which also transmitted lycanthropy.

Ecology
Weredogs were originally humanoids suffering from the lycanthropic curse, but whose strong, good alligned personalities were able to fight back against the infection. The result was an altered form of lycanthropy that allowed the victim's personality to remain.