The sickening clips showed the depraved couple committing bestiality with the dog on three occasions.
Police are unable to find out whether his lewd acts injured the dog because he was dead by the time the videos were discovered, news.com.au reported.
The deformed couple had lived together in South Australia for several years, but have since separated.
They both admitted bestiality charges in Adelaide District Court on Thursday.
Under the State Criminal Law Act 1935, they could be jailed for up to 10 years.
Ms Thedgold’s attorney, James Marcus, told the court the mother of six was “disgusted with herself” by her behavior.
He said: ‘From Mrs Thredgold’s point of view, she thought it was something her partner wanted and it is quite obvious that, from Mr Thredgold’s point of view, that is also what He thought.
“The offense arose out of a vast sexual experimentation between the couple in which they engaged in risky activities. ”
Police attorney Georgina Venn pushed for the two men to be sent to jail, telling the court the offense was too serious to warrant house arrest or a suspended sentence.
“’The offense is undoubtedly serious and… morally repugnant in nature,” she said.
They will be sentenced next month.