When her home was searched police found a DVD and a USB stick containing film of her with dogs.
Victoria Rose, prosecuting, told Lincoln Crown Court: 'When the DVD was analysed it was found to contain extreme images.
'Those images portrayed persons committing penetrative sexual acts with dogs.
"Also included were images of this defendant herself carrying out sexual activity.
"Included was an eight minute and 59 seconds video of Mrs Bowditch engaging in vaginal and oral sex with a St Bernard dog named Oscar.
"When the defendant was interviewed she admitted she had penetrative sex with dogs.
"She accepted it had taken place over several years. She was unaware it was illegal."
The court heard there were at least eight photographs of Bowditch having sex with dogs and some 30 moving images.
Bowditch, from Evedon in Lincolnshire, admitted a charge of having sexual intercourse with an animal between 13 November 2011 and 25 November 2014.
She also admitted possession of 37 extreme pornographic images on 21 March 2016.
Daniel Galloway, 65, of the same address, admitted aiding and abetting Bowditch to have intercourse with an animal.
He also admitted charges of making indecent images of children, possession of a prohibited image of a child, distributing 1861 indecent images of children and possession of extreme pornography.
His sentence was adjourned to a later date.
Her defence James Gray told the court: "She is 64 and has no previous convictions.
"Both she and Mr Galloway have suffered considerable public humiliation. They have been ostracised by their friends and family.
"They have suffered that added element of punishment which in less salacious cases would not be present."
Bowditch was given a community order with 12 months supervision and a 16 week night-time curfew.
The maximum she could have faced for having sex with a dog was a two year jail sentence.
Judge Michael Heath told Bowditch: "What you engaged in was first of all unlawful and secondly disgusting.
"I am told that you have received public humiliation as a result of the publicity that this case has attracted. That does not surprise me."