Removing Dog Yeast Stains on Sheets?

My dog gets red yeast around her mouth (she's a jowly dog) and then when she sleeps she drools. The end result is red yeast stains on her doggie bed sheets and on my sheets when she sleeps in bed with me, which she only does occasionally. I had her sleeping on a towel, but during the night she moved off it :( I have tried bleaching her sheets and that lightens the stains but does not fully remove them.

My sheets are patterned so I would be hesitant to try bleach. My fiance is really annoyed about the stains on the sheets and I think they look pretty gross too so I want to get rid of them. Any ideas?

By Meagan M.