A. Any dog brought into the city for the purpose of participating in any show, exhibition, field trial or competition scheduled not more that thirty days thereafter;

B. Any dog brought into the city for the purpose of receiving veterinary care in a veterinary hospital, providing that the dog is confined at all times to the hospital;

C. Any dog owned or in the possession of a nonresident of the city which is to be maintained in the city for a period not exceeding thirty days;

D. Any guide or service dog actually being used to assist a blind, hearing impaired or otherwise physically disabled person.