A Thai man and his pet dog were found dead alongside each other after they both suffered heart attacks while having a threesome with a s** doll.

Praphan Tummasaeng, 56, was discovered lifeless with his genitals stuck inside the four-year-old female pooch named Honey in Khon Kaen province, northeast Thailand, this morning February 23.

Shocked locals called the police who entered the wooden hut, which had dozens of pictures of naked women stuck on the bedroom wall. The man was also hugging a life-sized s** doll with a dog's body and human face, which was lying next to him.

Police believe that Praphan, who had a coronary disease but relatives said refused to take medication, had suffered a heart attack during the 'over-energetic s**' with his dog and the doll.

Police Lieutenant Pairoj Sandee said: ‘The man had been dead for six hours when we arrived. There were no injuries and the mattress was in normal condition. There were also no signs of damage inside the home.

‘Inside the property, we only found the four-year-old female dog. The initial examination by the police doctor concluded that the cause of death was a heart attack triggered by sexual intercourse with the dog.

'We do not know how the dog died but we suspect that the incident was too energetic for it to survive and it suffered a sudden shock. The body of the dog will be cremated at the temple.'

Neighbour Wanlop Sameechaeng, 65 was the first to find Praphan’s dead body in the hut. He walked into the wooden shack after not hearing a response from Praphan.

When officers arrived they found that the dead man was naked from the waist down, wearing a white striped t-shirt, and had five pairs of female underwear close to his face.

The dog was removed from the cabin, leaving only Praphan and his doll.

Wanlop said: ‘Praphan's hut was only 300 metres away from the village. He had been caught stealing the villager’s underwear many times before. There were many issues about this.'

The deceased's sister Noona Tummasaeng, 45 said that her brother suffered heart disease and refused to take medication.

She said: ‘My brother is a divorcee. He has been living away from his wife and child for more than seven years. He moved into the hut and stopped socialising with anyone.

‘I never knew my brother was a pervert. I didn't know he wasn't normal. Our family believes that his cause of death is as the police stated.’

Police are not carrying out any further investigations.