He uses a number of indicators. Tides, full Moon, increase in
radon, etc. The domestic pets part comes from reading the
local paper charting the increase in the number of classifieds
looking for missing pets.
His "predictions" are generally two-week "windows" mostly in the
PacRim. I once heard Art Bell or a caller ask if his method
would have worked in 1906 San Francisco. He said he did run
the info he had available, but that quake fell outside his 1906
tidal/Lunar cycles.
Checking the classified for lost pets is a wee bit behind the curve, for early warning of impending quakes right? He’s a scam artist for sure.