The wereside is the "side" or part of a therian's nature which is that of a nonhuman animal. A wereside refers to an internal part of a person, not an external being, such as a totem or spirit guide.

Sometimes, "wereside" is used synonymously with "theriotype".

Example: A therian might say "My wereside is Wolf", meaning "I am a therian with the wolf theriotype."

There often seems to be some confusion about whether something is a wereside, or is a totem or spirit guide.

Basically, if it's a part of yourself, it's a wereside. If it's an external entity, manifesting to you or through you, it's probably not.