Bulk stock is money on a pallet. Large sacks occupy expensive space at a low margin, so knowing how fast each line actually moves is what stops a stockroom filling with the wrong brand for a year.
Living stock is a legal responsibility. Where an animal came from, when it arrived, how it has been cared for and who bought it has to be recorded properly, and that record protects the shop as much as the animal.
Deliveries form a round, not a favour. Once a shop carries sacks to customers, those drops need grouping by area and day, otherwise the service quietly costs more than the margin on what is delivered.
Some products are controlled. Medicated feed, flea treatments and anything requiring a prescription carry rules on sale and record keeping, and treating them like ordinary stock is the mistake that brings an inspection.