Before we start, it's important to note that Chihuahuas can develop food allergies at any stage in their life. Even if they've eaten the same type of name brand dog food for years, their body chemistry could change all of a sudden, causing them to experience an allergic reaction from it.
The crew also filmed many scenes in the north of Vietnam, as well as Oahu, Hawaii. No doubt the shots of Vietnam's tangled jungles helped to establish Skull Island's authentic 1970s feel. Check out the island for yourself in the trailer for Kong: Skull Island:
In the 1962 film King Kong vs. Godzilla and the 1967 film King Kong Escapes, the equivalents of Skull Island are called Farou Island and Mondo Island, respectively. Kong plays a similar role on these islands as the godlike being of the land, a role he plays in all versions of the King Kong story.