A man has died after being attacked by his dog in southern Tasmania.

Tasmania Police said the 66-year-old man and a 64-year-old woman were set upon by his dog late on Sunday night at his home at Allens Rivulet, south of Hobart.

Police and emergency services were called to the scene around 10:40pm.

Tasmanian Police Inspector Colin Riley said the "man suffered serious injuries to his lower legs and was sadly pronounced deceased at the scene".

"The dog was euthanased at the scene by an animal management officer from the local council."

Inspector Riley said a report would be prepared for the coroner.