PupBox National Pet Day Coupon: Get 75% Off! Posted by Hello Subscription on April 11, 2019. Subscription Box Coupons & Deals / PupBox Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Check out this PupBox coupon for National Pet Day! Get 75% off your first box with coupon code PETDAY. Valid on any 3, 6, or 12 month subscriptions. Save 75% on Pupbox! See our past PupBox reviews to find out more about this subscription! Visit PupBox to grab the deal!