A buckle (10) is preferably formed of identical portions (11) each including a metallic base member (12) and a plastic cover (22) molded around a portion of the base member (12). The base member includes a first flange (14) having a slot (16) therein, and a second flange (15) having an opening (18) therein. The cover (22) includes a body portion (23) which carries a magnet (25). A tab (26) and projection (27) form a hook on the body portion (23), and a slot (29) is formed on the body portion (23). When the two portions (11) are attached together to form the buckle (10), the magnets (25) are adjacent to each other and the hook of one portion (11) is received in the slot (29) of the other portion (11). To form a collar (30), one end of a strap (31) is attached to a portion (11) through the slot (16) and the other end of the strap (31) is attached through the other portion (11) through its slot (16). The openings (18) are also aligned so that a leash or the like may be connected to the buckle (10).