Is there a warrior cats cartoon?

Not an official one, but on YouTube there are quite a few cartoon series. The most popular of these is called Warriors of the Forest, or WOTF. It is a five video series lasting from the beginning of Into the Wild to Firepaw's apprentice ceremony.

Another populuir series on YouTube is ssswarriorcats productions. Unfortunetly theres only 1 video but their macking another.