poor little pup...
do they think that the vomitting and itchiness are related?
Luca (groenendael) has also had itchy skin all her life (she's nearly 6) - basically from the day I brought her home - it got really bad a couple of years ago - exactly as you are describing - esp on the backs of her back legs, armpits, and esp under the chin, to the point of it becomming infected with all the constant scratching and biting - she also gets an itchy vaginal area sometimes, but not sure if this is related
We have tried all sorts of things - currently she is pretty good - the only thing she still does all the time is rub the under-side of her chin - on anything from your knee if you are sitting down, to furniture and even the door frames... ultimately i think what has helped her the most is lots of swims in the ocean, and her diet, which is now no red meat (apart from the occasional bone), high quality dry bikkies (skin and digest blend), + supplements including calcium ascorbate, fish (tinned sardines at least once a week), fish and olive oils over her food, yoghurt, and 1/2 cortesone tab for a few days if it flares up, as well as aloe vera and inflamol directly when nec...
would be interested to hear if the phenergan helps - haven't heard of this being used before
It is going to be a long process I feel, and am sorry for your poor little pup, as well as you - it is so hard to watch them - I am constantly telling her to stop chewing on her feet, or scratching etc - i think it becomes habitual as well...
IMHO, I don't know that it is an environmental thing, as we have lived in different areas, some with grasses, some without, but I do think that the sea and sea air has really helped - I have heard of other belgians with the same problem - but not saying all will have it of course...
good luck