Is a large concentrated bag more economical despite a high purchase price?

Often yes, on two cumulative conditions: that the concentration genuinely reduces the ration and that the bag is consumed before oxidation. The high purchase price can be offset by a smaller ration and a lower price per gram, but only the cost per day actually consumed confirms it. In depth ### Two favourable effects that stack A large concentrated bag stacks two levers: density, which lowers the ration, and format, which lowers the price per gram. When both play, the cost per day can fall below that of a small low-density bag, despite a higher purchase price. The effect still needs verifying by calculation, since it depends on the real size of the density gap (Royal Canin Academy). The freshness condition frames the gain. A large format is only economical if it is finished before the fats oxidise, which assumes sufficient consumption. Worth stressing: on a large dog these two conditions are generally met, whereas on a small pet the bag risks turning rancid, which can cancel the advantage of both concentration and format. ### Measure the cost per day consumed The net saving is calculated on the quality feeding days actually provided, removing any wasted share. This cost per day is compared with that of a smaller format or a less dense food, costs included. A tested rather than calculated density makes the result more reliable, since the modified Atwater calculation can underestimate the kcal (Petfoodindustry). Comparison table | Condition | If met | If not met | |---|---|---| | Markedly higher density | smaller ration, possible saving | no ration saving | | Bag consumed before oxidation | gain preserved | waste, added cost | | Price per gram of the large format | lower | limited advantage | | Verification | cost per day consumed | cautious conclusion |