Hi
You didn't make it clear that she was on her knees from the moment the dog started licking her. In fact, I had an image in my mind that the dog was climbing up he to reach her face.
My suggestion:
A girl wearing a strapless tank top comes up and asks for permission to play with your active and cute dog. You gladly agree, so she kneels down to start stroking it. Your dog first sniffs her and then starts jumping up to
climb on her front to lick her face.
She is now on her knees. All of a sudden, your dog's paw accidentally pulls her top down, revealing her breasts.