Abstract: The present invention relates to a galenic composition suitable for administration to a non-human animal, including at least the following three components: one or more active principles; an agent for accelerating delitescence; an agent for delaying delitescence, wherein the agent for accelerating delitescence an the agent for delaying delitescence are integrated in the composition so as to form a matrix with the controlled release of the active principle(s). The invention also relates to the uses of said compositions, as well as to a method for measuring the in vitro delitescence thereof.