All the dogs get tuna or sardines quite regularly. I'm still puting it down to moulting as Missy is a little tufty at the rear end but obviously this is the first spring moult I've had with Zak.
Might get some omega oils as a supplement if the aloe vera doesn't work.
Harry gets quite dandruffy as he moults. Course, it doesn't help that we rub him vigorously all the time on his rump cos he loves it and it's fun to watch his back leg twitch!! But that's by the by....
Anyhoo, we've got some pre-moistened bathing cloths that we wipe him with when he's flaky. They're perfectly safe and gentle and okay for daily use. They just take off the worst of any surface grease and flake.
ps: sorry, forgot to say that we got them from Pets at Home. 80 cloths for about £6 or so.