The article is intended as an argumentative contribution for the creation of a legal theory on animal rights, based on an abolitionist standpoint (with a scarce inclusion in national debates) of animal protection fights that promote the elimination of the legal-social institution of the ownership on animal in all human activities. For this purpose, the article includes basic proposals and sketches a scenario of ethologic evidences that support such moral philosophy proposal and the legal concretion so constituted. In the same way, the article contemplates the need for generating moral and social changes as the basis for reaching juridical transformations.