Radio-frequency antennas; Radio-frequency identification (RFID) readers; Radio-frequency identification (RFID) tags; Radio-frequency receivers; Radio frequency identification (RFID) credentials, namely, cards and tags, and readers for radio frequency identification credentials; Radio frequency identification (RFID) tags; Radio frequency identification tag readers; RFID readers; RFID tags worn by pets that activate pet care devices; Transmitter and receiver used to locate lost pets