I started Coco at 10 weeks. I started slow though, I would put the grooming materials on the floor for a couple of hours a day. She would go sniff them, play with them and just not be afraid of them. I even turned the trimmer on a couple of times while holding her, so the sound wouldn't scare her. Now she is a doll, when it comes to trimming. She just sticks her head between my legs and lets me groom her.