Our expert says:
I am not a vet, but have found that a lot of these sorts of skin problems are psychosomatic, in other words related to anxiety. Is she a very highly strung dog?
Sometimes the scratching is reinforced by the owner paying attention to it, even if it is negative attention, so ignore it as much as possible. Try to distract her rather, by throwing her a chewy toy or interrupting the behaviour with a noise like her bowl rattling, but don't say anything or look at her.
I have also found that yoghurt or whey powder is very effective in curing this kind of thing. Give her a little plain yoghurt in her food every day and/or mix it with water and put it on the spots that are itchy once a day. The lactobacillus is a prebiotic that seems to balance out the body's good bacteria.
It may be worth trying her on a veterinary diet as some dogs are allergic to some kinds of dog food - ask your vet to recommend a good one for skin problems.
Daily firm but gentle brushing with a rubber mitt will also help to reduce anxiety and condition the skin. Make sure all her needs are met and that you are interacting with her correctly - if unsure get a behaviourist in to help.
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