The hairy shore crab is the most common shore crab. It is seen in abundance in all kinds of colors and patterns.
This small crab has fine hair on its legs, a notch between its eyes and three lateral spines, which are the little pointy “teeth” along each side of the shell (carapace).
Look in pools and puddles, as well as under rocks. In sandy areas, you may see what looks like tiny tire tracks across the sand. Those are the prints left by fast moving shore crabs.
The hairy shore crab can be carefully handled. Remember to always put creatures back where you found them.
For more tiny crabs, see Black-clawed crab, Purple shore crab.
Pacific Wonder Tracker 
The last picture is showing the underside of a juvenile male red rock crab
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Greg, thanks for pointing that out. I will note it in the text.
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