A pit bull mix was brutally raped, murdered, and hung from a tree, say police.

A mountain biker in Thurston, Washington on Department of Natural Resources property discovered the abused animal on Monday and contacted the authorities.

The dog appears to have been 'severely sexually abused' while still alive and restrained, according to Fox.

Travesty: A pit bull mix (not pictured) was brutally raped, murdered, and hung from a tree, say police. The dog appears to have been 'severely sexually abused' while still alive and restrained

The dog later died of asphyxiation after being hung from a tree.

'This is a truly horrific situation in all aspects, ‘the humane society’s Washington director, Dan Paul told Fox.

'To think about the suffering this dog experienced in her final moments, as well as knowing there’s an individual or individuals in our state who would perpetrate this type of abuse, is sickening. We are hopeful this reward will bring someone forward with information about this despicable crime,' he added.

A $5,000 reward has been offered to anyone who has any information about who is responsible for the heinous crime.

Thanks to a donation from a board member, the reward is twice as large as the amount the authorities would normally offer.