Paul Donaldson

Keith Srakocic / The Associated Press

Pittsburgh Deputy Police Chief Paul Donaldson said he doesn’t know if a protective vest would have saved the life of the late K-9 Officer Rocco, but the bureau is planning to purchase newer, more practical protective gear for the 24 K-9 officers currently on the force.

The $26,273 price tag of the vests will be covered by donations from the general public in the wake of Rocco’s death, funneled through the Pittsburgh Foundation, the Black n Gold Girls and the Fraternal Order of Police.

The city's two highest-ranking police officials appeared Wednesday to testify before a federal grand jury believed to be investigating the mayor's use of police-issued bodyguards and other matters.

Acting police Chief Regina McDonald and Deputy Chief Paul Donaldson entered the grand jury room at about 9 a.m. and left about two hours later, declining to offer specifics.

"Can't tell you anything," McDonald said as she left. "We're not permitted to talk."

"We were just here to assist them with the investigation," Donaldson said.