Brian Louis George L. Chapman was allegedly caught on CCTV having intercourse with the animal in somebody’s garage.
Mr Chapman, 21, was delivering letters in Crookston, Minnesota, in the USA when a resident allegedly captured the sickening footage.
The man said he grew suspicious when the postie entered his garage but did not immediately leave, KSTP reports.
Reports made to the local authorities say the man saw the postman “performing a sexual act with his dog” when he watched the footage back.
A police officer who watched the footage is said to have seen the same thing.
Mr Chapman was charged with second degree and burglary and bestiality.
Burglary is a felony in in Minnesota and can carry a maximum penalty of 10 years in prison and a $20,000 fine.
Beastiality is classed as a “misdemeanour” and carries a maximum sentence of 90 days and a $1000 fine.