Body cam video shows the rescue at Lansdale Catholic High School last Saturday.
The department says Sergeant Matthew "The Fox Whisperer" Erbele and Officer James "Steady Hands" Thompson responded to the call.
In video posted to the police department's social media page, you can hear the officers try keep the animal calm.
"Don't bite. We're trying," one officer says to the fox.
They held the fox down and cut away the netting before the animal safely ran off.