My grooming skills

I was too ambitious …groomed both Uno and Abby today from 10am till almost 7pm! Ended with a terrible backache, tired arms and 2 happy dogs ;) Both trims turned out well but what really made me happy was that Abby did not shiver one bit during her session. Was it due to her confidence in me or has she become accustomed to the clipper? Or maybe it was a little of both.