Section 77. Examination by veterinarian prerequisite to destruction of animal

No animal shall be destroyed by  the  commissioner  or  by  his  order  unless  first  examined  by  a  veterinarian in the employ of the
  department, or whose work is approved by  the  commissioner,  nor  until
  such  veterinarian  renders  a  certificate  to the commissioner, to the
  effect that he has made such examination, that, in  his  judgment,  such
  animal  is infected with a specified infectious or communicable disease,
  or that its destruction is necessary in order to prevent or suppress, or
  to aid in preventing or suppressing such disease.