Conn. Gen. Stat. § 22-366
Any person who crops or cuts or causes to be cropped or cut off the whole or any part of the ear of a dog, unless such person is a registered veterinary surgeon and unless such operation is performed when the dog is under an anesthetic, shall be fined not more than fifty dollars for the first offense and be guilty of a class D misdemeanor for each subsequent offense. The possession of a dog with an ear cropped or cut off and with the wound resulting therefrom unhealed, confined upon the premises of or in the charge or custody of any person, shall be prima facie evidence of a violation of the provisions of this section by the person in control of such premises or the person having charge or custody, unless such person has in his possession a certificate of cropping from a veterinarian registered in this state certifying that he performed the operation and giving the date of the operation, the name of the owner of the dog and a description of the dog.
Conn. Gen. Stat. § 22-366
(1949 Rev., S. 8576; 1953, S. 1853d; P.A. 12-80, S. 82.)