Doctors Foster and Smith cut up to 40% off a selection of pet food and supplies during its Black Friday Sale. Plus, with orders of $125 or more, apply coupon code "50GIFTBK" to receive a $50 Doctors Foster and Smith Gift Card for free. Even better, orders of $19 or more qualify for free shipping; otherwise, it adds $6.99. Some brands are excluded and cannot be used to earn the gift card. Deal ends November 28. A couple of best bets: