This one got us the other day. My wife was panicking that the washer was leaking. Turns out never wiping the dog hair off the gasket cloggs the weeps holes and it starts to drip onto the floor

If equipped, clean out your detergent/softener dispensors. Most pop out, but some may need a screw or two removed.

Also, some washers have a sump filter that needs cleaning. (little panel at the bottom-left of the front on Samsungs)