I am a groomer. I can tell you that a four month old puppy likely having his first grooming is going to be a squim worm COMPLETELY! PATIENCE IS THE KEY! Trust me! I always book a 3 hour session for first time groomers. It is scary for a pup to have all these things done at once so be patient, I always put a dag of peanut-butter on their nose or on the grooming arm to keep their attention. Play with his feet often and cut his nails often, use sights sounds and feels that he would be sunjected to at a grooming salon and in no time your baby will be fine