Movie about stranded prople on an island with dog like monsters

Watched this movie only once, that too not completely, the notable features were -

i. possibly made in late 90s to early 2000s.

ii. a group of people in 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)

iii. the island is infested by swarms of dog like monsters

iv. there are world war II era japanese bunkers and machine gun weapons which the survivors use.

What is the name ??? any ideas ???