Fara Maku and Tea Gora were both transformed into werepanthers by Anansi, Fara Maku directly and Tea through Fara Maku. In order to turn a person into a werepanther, one must place the Mark of the Panther upon that person; this usually has to be done by a werepanther, although a magical being such as Anansi can also accomplish it.
The transformation of a werepanther from human to panther form is generally activated by a state of anger. When the werepanther takes on panther-shape, he or she takes on the form of a normal panther, his or her garments blending into the fur of the panther's body.
Apparently, each werepanther, in their panther form, can place the Mark on one other person. Tea has not done this yet.  Interestingly however, she did claw at Goliath, though either this didn't count as transferring the Mark or the magic doesn't translate to gargoyles. 
- Werepanther at Wikipedia, the Free Encyclopedia