New York Consolidated Laws, Agriculture and Markets Law - AGM § 111. Identification of dogs

1. Each dog licensed pursuant to subdivision one of section one hundred nine of this article shall be assigned, at the time the dog is first licensed, a municipal identification number.  Such identification number shall be carried by the dog on an identification tag which shall be affixed to a collar on the dog at all times, provided that a municipality may exempt dogs participating in a dog show during such participation.

2. No tag carrying an identification number shall be affixed to the collar of any dog other than the one to which that number has been assigned.

3. A municipality offering a purebred license may provide a licensee, at his or her expense, any number of tags imprinted with the same number as the purebred license.  One such tag shall be affixed to the collar of each dog harbored pursuant to the purebred license at all times, provided that municipalities may exempt dogs participating in a dog show during such participation.  Such a tag shall be affixed only to the collar of a dog owned by the holder of the purebred license and harbored on his premises.

4. A municipality offering a license for any guide dog, service dog, hearing dog, therapy dog or detection dog may issue a special tag for identifying such dog, provided that such tag shall be in addition to the identification tag required by subdivision one of this section.  The municipality may prescribe the shape, size, color, and form of imprint of the tag which shall be a different color and shape than the standard identification tag.  Upon application, the commissioner shall furnish such tags without payment of a fee.