The dog's partner must be disabled and meet the legal definition of disability in the specific country or region. The dog must be specifically trained to mitigate the partner's disability in some way, e.g. opening doors, detecting high blood sugar or allergens and notifying of such, alerting to a ringing phone, leading those who are visually or mobility impaired. The dog must be trained to a high level not to be a nuisance in public, to be safe with members of the public and well-behaved, as well as being healthy and not posing a hygiene threat.