cleanliness is next to floodedness.
That could be the doggie wash. I found a hand-held shower head attached to a garage sink one time. My Clients were kind enough to inform me that many dog owners will install hand-held shower heads at sinks in the garage, mud room, laundry, etc., to wash the dog’s feet. I didn’t know that (in spite of the fact that I’ve owned a few billion dogs in my lifetime).
Jay!
What in tarnation is this mess about? I don’t think I see the whole picture.
What ever it is does not look right.
Marcel 
:weird:
Just a tail piece on the sink basin.
No trap or drain connection visible.
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