IAMS Hairball Complete Dry Cat Food, 3kg Chicken

The IAMS Hairball Complete Dry Cat Food in Chicken comes in a 3kg bag at £15.00 and takes number four in this guide. It is not the cheapest bag in the running: the 10kg bag at £16.35 undercuts it by £1.35 while holding more than three times as much food. Divide the £15.00 by three kilos, though, and this one lands at £5.00 per kg — a long way from the £13.59 per kg of the 2kg bag at the top of the shelf, and a long way from £1.64 per kg at the bottom. Judged on the headline number the IAMS bag looks mid-priced; judged per kilo it is a different proposition.

The rest of the listing carries its own oddities. The rating is 4.7 out of 5 from 5,951 ratings, and the chart beside it breaks down 100 ratings — 82 at five stars, one at one star — which is a sample, not the whole 5,951. The first bullet claims 88% animal protein, qualified as being out of total protein, so it describes a share of the protein rather than of the food. The wheat free claim carries the listing's own asterisk: produced in a factory which handles wheat. And the specification fields include "Dog Breed Size: Medium" on a cat food. Everything on this page is taken from the Amazon listing for this product; we have not tested it ourselves.