Six Labradors will be killed at the end of a medical trial testing dental implants at a Swedish laboratory.
The two-year-old animals will be killed at the University of Gothenburg so that researchers can continue to test how the implants alter bone and tissue.
As part of the testing, each of the black Labradors have had more than a third of their teeth extracted and replaced with implants.
The Djurrättsalliansen (Animal Rights Alliance) is trying to prevent Venus, Milia, Mimosa, Luna, Lotus and Zuri being killed at the end of their treatment.
More than 80,000 people have signed the petition put forward by the Animal Rights Alliance.
But the chairman of the organisation has said that despite the signatures 'in two weeks they will be killed' the Harliga Hund reported.
The case has drawn outcry in Swedish media, with a vet called Mark Collins recently speaking on TV4 to deplore the treatment of the dogs.
Mr Collins said 'I do not understand at all' - he described how removing a Labrador's teeth requires great force and would put them in substantial pain.
He added that because of the close bond they have with humans the treatment they have received would leave the dogs 'emotionally broken'.
Fury over plan to kill six dogs as part of lab experiment in Sweden
Six Labradors will be killed at the University of Gothenburg at the end of this month despite a petition with more than 80,000 signatures. Pictured: Dogs in a previous experiment.
