Churr

Churr (Churring) is a term to denote the sound related to the emotional state of happiness. Widely used by many furries (character-based or human).

When vocalized, Churring typically sounds like a short, sharp, music-like happy yelp. It is worth mentioning that "Churring" is a recognized real life vocalization among canines, particulary dogs, and noted by most dog breeders. This term is not to be confused by its more pleasure-related term, murr.