right before the northridge quake my g friends two cats
would not come out of hiding about 24 hours before the BIG one.
they did the 'belly crawl' to check out the scene but would not leave the closet....

as for the dogs, my brother's dogs howled in the hours preceding the quake. the also gave him a early warning on the two friday aftershocks later that week. not an exact science but pretty compelling.