A dog who was used for sex by his Colorado owners had to be euthanized after the traumatic experience left him too aggressive to be safely adopted.

Bubba, an Akita-mix, was put down by Aurora Animal Services on Tuesday just hours after one of his owners was jailed for having sex with the dog.

The dog's handlers at the animal shelter said he had become increasingly aggressive ever since authorities took custody of him this past summer when his owners were arrested.

Shelter staff had determined that Bubba was unable to be safely adopted given the traumatic ordeal.

Bubba, an Akita-mix, was put down by Aurora Animal Services in Colorado on Tuesday just hours after one of his owners was jailed for having sex with the dog

His owners, Frederick Manzanares, 51, and his ex-girlfriend, Janette Solano, 49, pleaded guilty last month to animal cruelty charges after repeatedly having sex with their dog in a backyard motor home that they converted into a sex chamber.

Manzanares was sentenced to six months in prison on Tuesday and will be placed under supervised probation for two years.

His ex-girlfriend negotiated a two-year deferred judgement and sentence, which means she will not be convicted or serve time in jail unless she violates the terms of her release.

In handing down Manzanares' sentence, Judge Cheryl Rowles-Stokes acknowledged that she had taken Bubba's condition into account when decided on a punishment, the Denver Post reports.

'This dog cannot safely be adopted,' she said. 'This dog cannot safely be transferred. This dog cannot recover.'

Jenee Shipman, the manager of Aurora Animal Shelter, had written to the judge prior to Bubba being euthanized.

'The dog has exhibited unpredictable behavior and shows signs of aggression towards veterinary services staff, volunteers, community service workers and staff members that the dog is not especially familiar with,' she wrote.

Owners, Frederick Manzanares, 51, and Janette Solano, 49, admitted to repeatedly having sex with the dog in a backyard motor home that they converted into a sex chamber

'It is my opinion this dog is not a safe adoption candidate or transfer candidate based on the history, kennel behavior and continued increase in aggression observed daily.'

The dog had been living in the animal shelter ever since Manzanares and Solano forfeited custody of Bubba as part of their plea deal.

Police said they found footage of the couple having sex with Bubba after they were initially called in to respond to a domestic violence incident.

Solano had called authorities in March last year saying the couple had an argument and that she was leaving Manzanares because he pressured her into having sex with their dog.

Solano claimed that she first discovered pictures of bestiality on the couple's shared laptop and then confronted her boyfriend about them.

She said Manzanares told her to have an open mind and convinced her to start having sex with Bubba.

Manzanares had created a customized red padded bench in their motor home to make it easier to have sex with the dog.

He used dog hormone spray to arouse Bubba and would film them having sex with him.

Solano said she started to become 'somewhat jealous' of her boyfriend's relationship with their dog and that it would often lead to arguments.