The body of the 41-year-old man was discovered by a neighbour late on Tuesday afternoon, stretched out on his bed with wounds to the neck and chest.
His pet dog, a Boxer, was also found in the apartment in the town of Hérimoncourt, and according to a report in Le Parisien on Thursday. Police investigators suspect the animal of having killed its owner.
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The last person to see the man alive was his 12-year-old son, as he left for school on Tuesday morning.