Claim 1: a composition for use in a method for preventing or treating Canine atopic dermatitis (CAD) of a canid, preferably of a domestic DogWhere is given an effective amount of the composition to the canid, preferably to the domestic Dog,And wherein Said composition comprises: (a) a Particle Core with at least a First binding site； and (b) at least one antigen (Antigen CIL Canine interleukin - 31 - 31) at leastS a Second binding site.Where the cil - 31 or preferably comprises Antigen is a Protein with the amino sequence of SEQ ID no. 22 selected or a Protein with an amino acid sequence of at least 90%, preferably at least 92%, more preferably at least 95%And more preferably at least 98% identity of Amino Acid Sequence with SEQ ID no. 22, where (a) and (b) are linked through said at least one first and said so mA Second Enos binding sites through at least a Covalent non peptide.Claim 13: a composition comprising: (a) a viral Particle (VLP) with at least a First binding site； (b) at least one antigen (Antigen IC Canine interleukin - 31L - 31) with at least a Second binding site.Where the cil - 31 or preferably comprises Antigen is a Protein with the amino sequence of SEQ ID no. 22 selected or a Protein with an amino acid sequence of at least 90%, preferably at least 92%, more preferably at least 95%, and more preferably at least 98% identity of Amino Acid Sequence with SEQ ID no. 22Again, more preferably comprising Said antigen,Or preferably consists of a Protein with the amino sequence of SEQ ID no. 22, where (a) and (b) are linked through said at least one first and said at least one Second Sites dE Union through at least a Covalent non peptide.Reivindicación 1: Una composición para el uso en un método para prevenir o tratar la dermatitis atópica canina (CAD) de un cánido, preferentemente de un perro doméstico, donde se administra una cantidad efectiva de dicha composición a dicho cánido, preferentemente a dicho perro doméstico, y donde dicha composición comprende
