Or at least my black labrador did whenever she had been for a swim in a nearby lake.

They love you and and want to share the experience ? All mine have done the same.

It's very scientific.

https://www.youtube.com/watch?v=kvoKN1UfLn0

So that you absorb the water and it doest land back on them - they're not daft

Because they are very generous and like to share, just like my boys have always loved to roll in manure then try to share it by rubbing it on me!
Charming creatures but I wouldn't be without them

Well, you can imagine how I felt when I went for a walk on the beach and there was someone there walking five Labradors... who all emerged from the sea together, before heading straight for me and shaking in unison,