
I don't feed exclusively dry to any of my dogs but have in the past found that Wafcol Salmon & Potato has been useful in achieving and maintaining good quality of coat :)
I think you'll find that at the moment there are thousands of dogs suffering from excessive moults, regardless of diets. One of mine (long coated breed) looks like she had a litter 10 weeks ago she is so bald yet she had a superb coat until April >sigh< Since then all of mine have been losing coat even when the new one is growing in and at shows and chatting with friends it's a common problem which (no scientific proof LOL) we've each concluded is down to the weird and wonderful changes in the GB weather.
There are several liquid coat supplements available which may help and can be drizzled over her existing diet should you be otherwise happy with what you're feeding or you could simply add a
little olive oil instead. Holland & Barrett also sell good quality Vit E and Evening Primrose Oil capsules which would be another alternative.
All above said, I'd personally be inclined to add around half a small tin of sardines to her food each day - a more natural alternative IMO and one she'll enjoy better :)
regards, Teri