A frantic young male deer that had been hit by a car in Staten Island on Monday afternoon dashed into a dress shop and was trapped inside, bleeding, until cops finally tranquilized the animal an hour later, according to surveillance video and the store’s owner.

“I’m looking at the video again now,” said Mario Cavuoto, the owner of In Phase Fashions on New Dorp Lane. “The poor guy was really panicked. He was running in circles because he was trapped.”

Cavuoto told The Post that the buck came into the open door of his shop around 2 p.m. and his wife, Margaret, called 911.

“He was a young guy with small horns just starting to grow and I heard he had been hit by a car just outside,” he said.

“The cops came right away, but they were standing in the door, and the deer had nowhere to go, he was trapped.”

During the 60 minutes that the injured buck was trapped, video shows him running in circles and bumping up against the walls and mirrors, leaving large trails of blood.

Cavuoto said that when Animal Control arrived, the deer was tranquilized, roped up and taken away on a stretcher.

“It’s a mess in here. There’s blood everywhere,” said Cavuoto, who has run the shop for 50 years.

“Nothing like this has ever happened. A squirrel came in once, but that was it. This was a mess. I felt so sorry for that deer.”

Police did not immediately return comment on the condition of the animal or where it was taken.