
There are a few supplements out there on the market at the moment. One which I have recently tried is Yumega which is a combination of flaxseed and starflower with some antioxidents as well. I had a long chat with the director of this before I used some (he gave me some to try) and I have to say I saw an improvement in my GR as she's always had dry flaky skin since puppyhood (she saw various specialists and was on evening primrose tablets and these did help, but didn't cure)
Yumega has a website where you can find out more, can't remember the site off the top of my head but if you google it it's bound to come up :)
Which food did you change from?
Anyway hope this helps, has worked for mine :)