Even when you use a very gentle formula, it is important to understand that washing a dog too frequently can cause problems. With too frequent washing, you may find that your dog starts to itch and develop irritation on their skin. Your dog’s skin may also start to become dryer than usual. This is due to the fact that shampoos generally strip the natural oils from your dog’s hair. With this said, note that you do still have to wash your dog at appropriate intervals to prevent knots in their hair and similar problems. If your dog has sensitive skin, then it is generally important not to wash them more than once a month. On the other hand, if you haven’t washed your dog in the past three months, then they are definitely overdue for a bath. You also have to keep in mind the specific shampoo that you use for your dog. Some companies may have specific recommendations or instructions on the ideal frequency when you use a particular shampoo.