I watched this movie only once, and I didn't see the whole thing. It was in English — it was not translated from other language, but it could be American, British, Australian, anything. I saw it on a local cable channel.
The notable features were:
Possibly made in late 90s to early 2000s.
A group of people on a Pacific island (not the storyline of LOST), the people might have come by their own will and were possibly unable to leave (not exactly sure about this)
The island is infested with swarms of dog-like monsters. Literally swarms, by the hundreds and thousands. The animals are not a result of any scientific research or experiment.
There are World War II-era Japanese bunkers and machine gun weapons which the survivors use. There are even Japanese army records of the creatures and possibly the Japanese WWII base was destroyed / left in ruin by the creatures.
What is the name of this movie??? Any ideas???