The Indus Dictionary Project
This is a pictograph of a row of six teeth. The six teeth represent canine incisors. Hence, this Indus symbol is the noun incisors.
Ur: Stamp seal: Museum Number 122847: British Museum Collection Online: http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=805148&partId=1&searchText=indus+seal&page=1: Accessed: 27 October 2018.
In the inscription from Ur, the row of six incisors is followed by the guard dog sign. In context, it therefore refers to a dog's teeth. However, other mammals also have a row of six incisors. Thus, it may be that in practice, the sign was used to refer to the bites of other animals in addition to dogs.
Indus Script Sign Number 9832: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.