Holly didn't bond to me for months. It scared me alot in the beginning because I loved her (and still love her) to pieces. Eventually she warmed up to me & now she knows I'm her mama! Although she's still an independent little dog, likes to do her own thing. All dogs just have different personalities. My cousin's yorkie bonded to me so fast. Like the second I would walk in the door she'd jump in my arms and play with me and cuddle for hours. Holly is the same way, but once she knows I'm home she just goes back to doing her own thing.
Some doggies just like to be independent. Who knows!