Dogs find things and dogs like bones. It’s as “simple” as that.
Just released is Keith Jacobi’s fascinating story on dogs that are used in forensic studies and how he himself got involved. It is truly a remarkable tale.
Reference:
Jacobi, Keith P.
Cadaver Detection in Forensic Anthropology and Criminology: An Overview with Personal Notes. In Canine Olfaction Science and Law: Advances in Forensic Science, Medicine, Conservation, and Environmental Remediation, edited by Tadeusz Jezierski, John Ensminger, and L.E. Paper, pp. 245-257. CRC Press, Boca Raton.