I feed mine alittle bit (about a tblsp per dog) of canned pumpkin, not pie filling, mixed with low fat yogurt and water once a day. I haven't had to express the glands in a while. It's actually easy to express them yourself.
here is a site that shows you how
The Anal Sacs Page
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Mommy of Cody,Gracie,Bella,2labs,1cat, 2 skinkids
one Angel Baby Boy
8/8/09 I carried you under my heart for 20 weeks and will carry you in my heart forever