There have been a lot of different debates as to how often one should bathe their dog. I've taken the time to do some research on this topic and thought I would share some information that I found.
Older research has shown that bathing your dog once a month is more than enough. However, this notion is now a thing of the past. The reason why older research says to limit your dogs baths is because the quality of dog shampoos back then contained harsher chemicals causing the dog's skin to dry out and stripped the dogs coat of its natural oils. These days, dog hygiene includes shampoos with aloe, conditioners, and organic ingredients that are almost comparable to human hair products, which are much more gentle and designed for more frequent use.
Other factors to consider include: the breed of dog, the dog's hair type (long/short coat), the dog's lifestyle, shedding cycle, and allergies.
Breeds with softer and longer coats tend to pick up dirt more easily while breeds with textured and shorter coats have the ability to repel dirt.
Dogs that spend most of their days outdoors should be bathed more often than a dog that spends most of his days on the couch.
According to the American Lung Association, humans with dog allergies should bath their dog as much as possible which will help remove the dander that accummulates on a pet's fur coat.
Dogs that suffer from allergies (or itchy skin) should also receive baths more frequently in order to wash away allergens before they get a chance to penetrate the skin.
In conclusion, the best answer to the question, "How often should I bathe my dog?" is "When he looks dirty or begins to smell, it's time for a bath."