This article is devoted to research of philosophical discussions about animal rights which have affected on content of international law and national legal systems. This has manifested itself in the gradually recognition of the rights of wild and domestic animals. The authors provide classification of these rights and, according to criteria of their scope, distinguish three groups of wild animals and seven groups of domestic animals (companions, circus, agricultural, sport, experimental, zoo and service animals). Domestic animals have both vested rights (protection against cruelty and to a favorable environment) and, to a different extent, the right to good treatment, choice of owner, good health (veterinary care), adequate burial and comfortable transfer – these mainly dependent on the owner’s goodwill. The article includes evidences that the current situation with a different scope of subjective rights of different groups of animals resembles the situation with a different scope of rights of certain groups of population in the age of feudal fragmentation. The authors also comment about gradual change and future of the situation.