I think they have to be animals that people don't mind seeing being CGi-killed. It's always sharks, piranha, snakes, bugs, dinosaurs, alligators or mythical beasts like the yeti. You can also throw in ghosts and/or the weather. Dogs have to be Hellhounds. Tigers have to be Attack of the SaberTooth.
Write all those things on pieces of paper, pull 2 out of a hat and you have your next Syfy movie. If you only do a storm, you have to pick a city or holiday. (Miami Magma, NYC Tornado Terror, Seattle Superstorm, Snowmageddon)
Mongolian Death Worm
Chupacabra vs The Alamo