Shampoo and conditioners are great for aiding with symptoms, but they dont fix the problem and they only offer help for the short term, the number of times I've had clients come in with vet shampoos and have me do their dogs every week with the stupid things….. only help about half the time. You have to get the the cause or you wont get anywhere.
12 years grooming and I still havent found a shampoo or conditioner that really makes that much of a difference unless you are dealing with a yeast problem where once the yeast is killed off things start to improve. Regular allergies, dry skin and itching cant be cleared up with a shampoo or conditioner.

Great article for allergies and pet food as well as another one on pet food. Love that they mention the importance of rotating your protein sources

http://healthypets.mercola.com/sites/healthypets/archive/2012/05/07/protein-diets-for-pets-allergy.aspx

http://healthypets.mercola.com/sites/healthypets/archive/2011/05/10/my-top-3-pet-food-picks-from-an-upscale-boutique-shop.aspx

There are some different plants and herbs that can help with allergies - nettle for instance (I use it in capsul form but you can also do tea) is helpful wth allergies

Often an allergy will show itself as a yeast problem either in the ears or between the toes that is the reason I asked about odor coming from the ears.

try little 5 minute bursts of training. Getting him to tire himself out mentally can compensate for the lack of the physical. Have him do puppy pushups (sit,down,sit), have him do some in house heel. A great time is if you watch tv together you can do mini training sessions on comercial breaks. Works really well to settle a high energy dog

Thanks for providing those I dont have any website links - I got my info from a canine sports rehabber that I met at a schutzhund seminar and am planning on taking her online courses in preperation for my Afghan hound who I hope to course and do agility with

It took me a year to get mine to go outside in the rain without her rain coat. She would stop at the door and plan her bum and not move without it. If I carried her out she would sulk in the rain and absolutely would not pee - her record holding it was 20 hours. At least she will pee on cement because getting her to go on sopping wet grass is a nightmare

If you can get it over there there is a company called Horse Herbs that makes an all natural arthritis herbal supplement. My 11 year old great dane mix has been on it for 2 years and it has made a world of difference. For those of you who are not aware, Danes have a life span of usually 7-9 years so he is very much the senior http://www.horseherbs.com/

I would also consider finding a Holistic vet in your area

My suggestion is to make sure her food does not contain wheat, corn or soy, and no animal byproducts

Stop using the shampoo it's crap, having used it myself many times as a groomer I can tell you I've never actually seen it work. Take her off the chemical flea stuff only use it if she gets fleas. Benedryl to get rid of the symptoms at her size I'd use 1/4 of the dose (this works well for any random allergy for the short term and good for bee stings) but only use it for a few days. How long before this reaction was the last set of shots? If it was within 3 months there is a good chance that is part of the problem. Stay away from all chemicals on her and for cleaning - there are MANY safe things you can use that kill bacteria and do just as good a job on your surfaces. Have you recently installed new carpet or had the carpet cleaned by a pro? I've seen this cause MASSIVE reactions on dogs that present as you have described. A picture of the problem would be helpful.

Are you also noticing a different odor on her anywhere? Perhapse in the ears?

For proper physical developement, the most recent studies show it is best to wait with any breed of dog until after 14 months old and for large - giant breeds after 18 months.