This is a pictograph of a monitor lizard. The key identifiers for this reptile are the long neck and the long tail.
Illustrative Text Reference:
Dholavira: Seal: SI. Number: 138: Acc. Number: 31420: (NB. The photograph is of the seal. Therefore, the inscription would be the mirrored image of that seen in the photograph.): R.S. Bisht, 2015: 8.2.3 Details of Individual Seals: Excavations at Dholavira (1989-90 to 2004-2005), p. 290: https://www.scribd.com/document/262316120/Excavations-at-Dholavifra-1989-2005-RS-Bisht-2015: Accessed: 22 June, 2019.
Image Credit:
Monitor Lizard: Lynn Fawcett, 2019.