My idea is simple, get OC sprays designed for use on animals
legalized in Belgium, by having a court limit the scope of application of the "Law on weapons 2006", Article 10, to a literal interpretation of it's text.
Article 10 of the Belgian "Law on weapons of 2006" states:
Les objets destinÃ©s Ã toucher les personnes au moyen de substances toxiques, asphyxiantes, lacrymogÃ¨nes et de substances similaires, Ã l'exception d'outils mÃ©dicaux [sont considÃ©rÃ©es comme armes prohibÃ©es].
Objects intended to project toxic, asphyxiating, lachrymatory or similar substances upon people, with the exception of medical tools [are considered prohibited weapons].
With animals being classed as "objects" under Belgian law, OC sprays designed for use on animals
should, logically, benefit from the same exemption from article 10 of the "Law on weapons 2006" as insecticide sprays.
Something similar could be done in the UK; arguing that OC is not a noxious substance and that carrying OC spray for the purpose of self-defense against animals
does not constitute an offense under the UK's "offensive weapon" laws.