If you must bathe the dog frequently in order to provide the allergy sufferer in your family some relief or to avoid allergic reactions to dander and hair, you MUST MUST MUST use a premium shampoo + conditioner line!

Cheapy, perfumed or storefront shampoos [Sergent, Hartz, etc comes to mind] may actually create the problem by irritating the skin, and causing itching and discomfort for your pup and resulting in excessive scratching, licking and chewing with skin irritation as a result.

Once your dog is well on its way to having skin allergies itself, courtesy of your faulty skin/hair care, you will be paying out of the nose to get it corrected via veterinarian care such as skin scrapings, cultures and testings. Plus many dogs with lasting allergic reactions get put on steroids [and they do as much damage to dogs as they cause temporary only relief!], medicated baths, dips and other treatments. In many cases these poor dogs are in a downwards spiral in regards to health. The expenses for vet care rise, the health problems multiply, your allergic reactions get stronger. Often times the owner gives up, finds a new home for the dog, surrenders it to ta shelter or rescue, or has it put down. This is so sad because it is fixable in most cases, it just takes a bit of effort, thinking outside the box and a month or two of time...

Use a premium dog shampoo that is all natural, without any artificial enhancements and ingredients. There are several good ones out there - do some research. One product line that I like a lot and feel comfortable recommending is Eqyss [often locally available in Feed and Seed type stores such as Tractor Supply and also in larger pet stores]. 

The shampoo line I now use exclusively for all of my puppies and adults is Quadruped Pet, and I would strongly recommend this one for families who have an allergy sufferer in the home or simply want to keep their pup's coat in top condition. It is made out of a natural yucca derivative and safe for young puppies, kittens as well as adult dogs and cats [and other pets too]. It produces awesome results in coat and skin health for my dogs, it does wonders for pets that themselves suffer from skin problems such as yeast and bacterial infections, hotspots, fleas and other allergies [it coincidentally also kills fleas and is safe to use as a flea control shampoo for puppies or adults!]. I love it all the way around and there are different varieties to choose from - after years of trying out everything under the sun and then some - this is what I use today and am not tempted to experiment any longer, LOL.  IT WORKS!

NuVet [where the wholesome vitamins that I recommend for puppies and adults come from], also has a very good shampoo line for dogs with skin issues - and in my book - healthy skin equals lesser allergens for your allergy sufferer.

Remember if you are a "frequent bather" - whether you do it yourself or your kid goes to the groomer for bi-weekly baths - you must use a better than average shampoo and you should condition as well! If your dog goes to the groomer for bath services, be sure to ask what shampoo lines they use. Cheap shampoos may be better for their bottom line, but premium shampoos create superior results and healthier skin + coat, and that is what you are looking for when a family member has allergies.