Television station WTAE in Pittsburgh says a sheriff's deputy working with the dog Sunday identified the player as Ray-Ray Armstrong.
Chief Deputy Kevin Kraus says a player lifted his shirt, beat his chest and barked at the K-9 before telling a deputy to release the dog. The deputy didn't release the dog.
He tells The Associated Press the player was in uniform heading to the field. He says a decision on charges could come this week.
Armstrong, the Raiders and the Steelers declined comment Tuesday.
Taunting a police dog is a third-degree felony in Pennsylvania.
Kraus says surveillance video captured part of the encounter.
AP NFL websites: http://pro32.ap.org and http://twitter.com/AP-NFL