We got Kelly, a female shep, when she was about 8 weeks of age. A lovable dog, she couldn't resist visiting (old) Midnight, the cat. Now Midnight napped in the center of a queen size bed, in a patch of sunlight, undisturbed for several years - enter Kelly.
Kelly would put her chin on the bed and gaze lovingly at Midnight. "Tick, tick, tick!"
"Ow, yap, yap, yap." We could hear Midnight's claws smacking Kelly's nose and the reaction.
Being a pup, Kelly never ever gave up trying to make friends. I think eventually Kelly had more important things to do than get her nose clawed - like guard the house.