That depends on the size of your cat. The EcoMinor and EcoHûs litter boxes are a normal size and perfectly suitable for most breeds of most sizes. The EcoDome and EcoGranda litter boxes are extra large and designed for very large breeds such as the Maine Coon. The British Shorthair is an average to large breed. Both the EcoHûs/EcoMinor and the EcoDome/EcoGranda would be suitable. Some cats are large but not heavy. An EcoHûs/EcoMinor would be fine based on weight alone but given their overall build, an EcoDome/EcoGranda would be better. And vice-versa, of course. All dimensions are listed on the product specifications page.