In an extreme case of animal abuse, photos allegedly shot at a German toxicology laboratory showed monkeys strapped to metal harnesses while dogs and cats were left bleeding.

Soko Tierschutz, a German animal rights group, along with Cruelty Free International released the photos Monday and said the abuse took place at LPT Laboratory of Pharmacology and Toxicology. An undercover activist, who worked at the facility from December 2018 to March 2019, said the animals, including dogs, monkeys, cats and rabbits, were kept in horrific conditions.

While the monkeys were strapped to metal brackets, the dogs were given capsules and had pipes forced down their throats. Most of the canines would often bleed following experiments.

Friedrich Mullen, an activist from Soko Tierschutz, said, “The animals were even still waggling their tails when they were being taken to be killed, the dogs were desperate for human contact. The worst treatment was kept for the monkeys. The macaques breed of monkeys are small, relatively light primates, which are often used for animal experiments at LPT. They are kept in cramped conditions in small cages. Many of the animals have developed compulsive tendencies and are seen going round in circles.”

Cruelty Free International, an animal protection and advocacy group, said, “Toxicity testing involves poisoning animals to see how much of a chemical or drug it takes to cause serious harm, in an attempt to measure what a 'safe' dose for humans might be. Animals are injected with or made to eat or inhale increasing amounts of a substance to measure the toxic effects which can be severe and include vomiting, internal bleeding, respiratory distress, fever, weight loss, lethargy, skin problems, organ failure and even death. No anesthetics or pain relief are provided.”

A case was registered and the investigation was ongoing.

In this image, a dog's paw reaches through the kennel fence at the Queen Anne's County Department of Animal Service in Queenstown, Maryland, Jan. 24, 2008. JIM WATSON/AFP/Getty Images