They do have gluten free stuff on their menu. Remember to get there for the early bird... 2 dinners for 20 includes salad or soup and dessert too. I think it's 4pm to 7pm. Hope that helps.
I'm not too savvy abt gluten free stuff, but here is a link to find the menu https://www.mymotherlode.com/directory-dining_guide/listing/guss-steakhouse And there is a facebook page for Gus's and says they are very responsive to messages
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