Joined Cases C-42/10, C-45/10 and C-57/10: Judgment of the Court (Third Chamber) of 14 April 2011 (reference for a preliminary ruling from the Raad van State (Belgium)) — Vlaamse Dierenartsenvereniging VZW (C-42/10, C-45/10 and C-57/10), Marc Janssens (C-42/10 and C-45/10) v Belgische Staat (Veterinary and zootechnical sector — Regulation (EC) No 998/2003 — Animal health conditions applicable to non-commercial movement of pet animals — Decision 2003/803/EC — Model passport for the intra-Community movements of dogs, cats and ferrets)