An aspiring veterinarian turned drug trafficker who sliced open live puppies to import heroin into the U.S. confessed Friday to his monstrous crimes.

Andres Lopez Elorez told the court he was in veterinary school in Colombia when he leased a plot of land on a farm to perform the heinous operations.

“I conspired together with an experienced veterinarian to introduce drugs into the United States of America through surgical implantation in dogs,” the 39-year-old admitted through an interpreter. “I did this even though I knew I was wrong and I was committing a crime.”

Prosecutors said that between 2004 and 2005, the fiend inserted packs of liquid heroin into the bellies of live Labrador puppies, and sewed them back up in order to secret the drugs into the United States.

The puppies were flown onto commercial flights into via JFK into New York City where they were cut open again to retrieve the drugs. The pooches died in the process, authorities said.

The twisted operation was uncovered during a 2005 raid on a farm in Colombia, and ten pups were saved. Three later died due to infections.

Elorez escaped, but was eventually captured in Spain in 2015, and finally transported back to the Big Apple in May.

He pleaded guilty Friday to a single charge of conspiracy to import a controlled substance into the United States.

Elorez faces up to life behind bars when sentenced on January 17.

Defense attorney Mitchel Dinnerstein declined comment on his client’s behalf as he left court.