I have come across another film The Thing, A prequel to the 1982 film of the same name. In 1982 an extra terrestrial vehicle is discovered below Antarctic ice by a Norwegian research team. They then discover what appears to be the dead remains of someone from the machine and remove the body into camp only to discover that it is not dead but has the capacity to hide in the bodies of selected human beings in such a way that most people will not detect the transfer.
The object of the creature is to escape from the area and multiply among the general population. Stopping the creature is led by Palaeontologist Kate Lloyd with the detection method to look at the teeth of other unit members as the creature cannot cope with metal fillings and a mouth will reveal this except for those who other forms of fillings, or the absence of any metal implants in their body. At the end of the film when it looks she and other members of team who survive are successful, a dog runs off, implying that he Thing has become the creature. I understand this is how the first film opened. Clever as it will make a number of viewer go to the original film. Not me though.