Rinse your dog thoroughly. As long as you see dirt or soap bubbles in the water coming off of an area, keep rinsing. You can use the same method you used to soak the dog's coat before shampooing. If your dog is too afraid of running water or the bath in general and can't be done on your own, there are veterinarians who can give proper sedation, not too much, to allow you to groom in a couple of hours or can groom the dog themselves. Touch the dog all over to feel for any shampoo especially the chest area and in between the legs they are hard to get. To test it, rub the fur in between you fingers and pull softly, if it feels squeaky then it's clean.
Dogs have a pair of anal scent glands that sit at the 8.20pm position on either side of the anus. Some dogs produce too much secretion and the glands stretch which causes the dog to scoot on his bottom. The glands can be emptied by applying gentle pressure underneath each gland, milking the secretion up and out onto a piece of cotton wool. Anal sac secretion is unpleasant so wear disposable gloves. Be careful not to squeeze too hard and if in doubt, stop and ask a professional groomer how to empty them.
Amongst apprenticeship programs and other hands-on training activities, Petco pet stylists who are trained from within the company are required to attend and pass Petco's comprehensive 12-week Pet Stylist Apprentice & Certification academy program. In addition to hands-on grooming training with a Petco-certified pet stylist mentor or instructor, all participants receive instruction in health, safety protocols and grooming salon operations. At the end of the program, candidates must pass a technical skills assessment in order to become a Petco Certified Pet Stylist.