Not at all as long as your dog doesn’t show aggression, grooming can become a part of their life. Groomers only see dogs every few weeks or months which isn’t enough to make an impact until several months or years later. The most important conditioning is done at home two times a week with combing legs, ears, near eyes, feet handling, etc. It’s never too late to start. Make it rewarding and pleasant so when you see the groomer its enjoyable for everyone and not an experience that is filled with fear and stress. A dog who gets conditioned weekly is an expert by the time it sees the groomer including puppies. It’s night and day when a dog gets weekly home grooming versus one that doesn’t.