Officials say officials from the Drug Enforcement Agency, Philadelphia Police and the Philadelphia District Attorney's office were serving a warrant in a drug case at 4337 Fleming Street when a dog attacked.
Police fired and the agent, 40-year-old John Douglass, was struck in the calf.
"As the officers and agents entered the premises and ascended to the upper levels of the residence, there was an attack by a canine which resulted in the friendly fire by the Philadelphia police officer to the agent," said DEA Special Agent-in-Charge Karl Colder.
The task force arrested Frank Herbert, the target of a month-long investigation into crack cocaine sales out of the house.
Neighbors tell Action News the street is notorious for drug sales.
Douglass was taken Temple University Hospital. He was last reported to be in good condition.
Douglass is 12 year veteran of the DEA.
