Hi Shelley,
It is odd sometimes the things that our dogs do? Ironically, I have one who likes to lick our bed sheets ONLY when she comes back to bed after her early morning potty break.
I was a bit bored yesterday so I googled this behaviour. What I found, in summary, is that it tends to be a result of anxiety or stress.
Is your puppy new? Is this a new home/environmnet for your dog? It also mentioned that they will lick to calm themselves because of stress or anxiety. I feel this is why my Yorkie does it. It's 3:00 AM when she goes potty some mornings and I think she does it as a way to calm herself back down so that she can fall back to sleep.
Other than the fact that something might be spilled there, it may be some stress that your pup is feeling.
Good luck and I hope you can find an answer.
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