PetSmart: FREE Science Diet Dog FoodFebruary 19, 2011 This post may contain a link to an affiliate. See my disclosure policy for more information. PetSmart is having a great President’s Day weekend sale! Through Monday, February 21st, all varieties of Science Diet dog food (4 lb bags) are on sale for just $5. There’s a $5 coupon available in an insert, so you can score it for FREE!Science Diet Dog Food (4 lb), $5 Use the $5/1 coupon from the 1/9 SS Final cost: FREE!And even if you don’t have a dog, consider purchasing this food and donate it to a local shelter.Thanks, Hip2Save!