As far as I know Dillons does not currently have a printed coupon policy. But here is a list of rules I've come across so using coupons in the store.
1) Dillons doubles coupons upto $1.00. Example if you have a $.50 coupon the register will automatically give you a $1.00 off. Same with a $.75 coupon it would round to a $1.00 also.
2) You can load digital coupons from Dillons.com and other sites to your Dillons card to use in store. These coupons do not double and you can only use them once.
3) You can not use a paper coupon and a digital coupon on the same item so make sure you don't download any coupons onto your Dillons card that plan to use in paper form.
4) Dillons excepts and doubles printable coupons (same rules from above).