An Adelaide man missing since Boxing Day is feared to have become a victim of foul play.
Kenneth "Kenny" Camplin, 42, was last seen on his verandah saying goodbye to two men leaving his home in Paralowie at 11am (CDST) on December 26.
A relative and friend checked on him on December 30 and found the back door unlocked and his dog nearly dead from starvation and dehydration.
Their concerns were heightened as Mr Camplin was very security-minded and doted on his dog.
Detectives said on Wednesday that his disappearance has been declared a major crime and they believed that he had become a victim of foul play.
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They want to speak to the two men seen at Mr Camplin's home.
They also released a video of Mr Camplin's schoolfriend, Rob, in which he asks the public for their help.
"He has a lot of friends worrying about him," he said. "His disappearance is totally out of character."
