Dog food, cat food, treats, litter and accessories are pricey at full RRP, and pets eat through them fast. Buying on promotion across brands like Whiskas, Felix, Pedigree, Bakers, Dreamies, Sheba and own-brand pet ranges saves real money over a year. We compare Tesco, Sainsbury's, ASDA, Aldi, Morrisons, Co-op, Waitrose, Iceland, B&M, Boots, Superdrug, Savers and Ocado (including M&S) daily so the biggest current drops on your pet's usual food show up first below.