Lice are quite a common cause of intense itching in dogs (occasionally cats). As in humans, biting or sucking lice lay eggs (nits) on the shaft of hair/fur and can been seen quite easily with careful inspection of the fur, especially around the head in dogs. Any grooming equipment should be carefully disinfected if your pet dogs get lice. Lice are usually spread by close contact with other dogs when playing or sleeping together. Keep your pet away from other animals until the infection is gone and treat all pets in the household. The best products to combat lice are Revolution and Advantage Multi.