My first thought was that she was itchy..but you said she hasn't been scratching and hasn't seemed itchy. So maybe she's "marking" by rubbing against it...marking the house as her new home. Dogs just do wierd things sometimes
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.