I henhold til Europa-Parlamentets og Rådets forordning (EF) nr. 998/2003 gælder der forskellige veterinærkontrolordninger afhængigt af antallet af dyr.
Regulation (EC) No 998/2003 of the European Parliament and of the Council of 26 May 2003 on the animal health requirements applicable to the non-commercial movement of pet animals and amending Council Directive 92/65/EEC provides for different veterinary control regimes depending on the number of animals.