It’s the universal canine expression of unfettered mucous joy.
[pity those who own Mastiffs or Great Danes....can you *imagine*?].....LOL
Their second most popular method of ‘sharing the love’ is to wipe ‘eye boogers’ or the remnants of their supper slobber on your leg.
How can you *not* feel the love?
[Odin is gently and discretely cleansing his nose of frothy salmon kibble crumbs on my shorts as I type this, possibly hoping that I’m ~not~ noticing it]
FWIW, goats also “greet” you by honking horrific gobs of supersonic snot onto your person...and then they daintily wipe their noses on your clothes.
[I’m not completely sure of *their* “social intentions”]
:)
My Black Mouth Cur is the worst for snorting on me but I know it means she is happy.