The unnamed man, who works for a security firm in Marseille, France, was arrested earlier this week following a complaint from a member of the pubic.
A shocking discovery
The concerned citizen spotted the pooch locked in the back of a vehicle parked in an underground car park. As well as showing clear signs of distress, the dog appeared malnourished and severely dehydrated.
Police managed to free the dog, which was then transported to a local animal hospital.
Veterinary experts believe the dog was 'living' inside the trunk for as long as six months. It will stay at the hospital for the next few weeks before going onto a rescue shelter.
A dog without a name
Officers managed to locate and then arrest the owner on animal neglect charges. When asked why he would leave a dog locked in a car for so long, the man replied that it was '"just a working tool". He then confessed that the poor dog didn't even have a name.
The man will go up in front of a judge within the next few weeks. If found guilty, he'll face up to two years in prison and a fine of €30,000 (around £25,000.)