Breeds prone to skin conditions, such as Cocker Spaniels, benefit from regular bathing about every six weeks. Double-coated breeds only need bathing about 3 or 4 times a year. Bathing a dog with an undercoat more often than this will cause the coat to soften and reduce the coat's insulative and waterproofing qualities. That depends on your pet's coat and any specific needs you have, like moisturizing the skin. Always use a shampoo specially formulated for dogs .
Human shampoos are harsher and are formulated with a different pH than what a dog needs.
Gather all supplies. Protect your pet's ears. Protect your pet's eyes. Properly lift your dog. Wet the coat.