Dry food is prepared by cooking then drying under pressure and spraying with fat to add stimulating odour to increase palatability. A preservative must be added to prevent that fat from spoiling. Wet foods are cooked, heat sterilised and sealed in sachets or tins. Because wet foods are vacuum-sealed preservatives aren’t necessary. Nutritionally, one type of diet is no better than the other. Dry food gives the teeth and gums more exercise so it may slow down the development of gum disease. Dry food is popular because it can be left in the bowl all day for your cat to graze on – and cats enjoy grazing – and it can also be used as hidden treats in activity toys or in paper bags, for your cat to actively search and find.
Cheaper commercial foods have variable formulas but usually a set level of protein, fat and calories. More expensive foods, called ‘premium’ and ‘super-premium’ are made to fixed formulas. These are always made from exactly the same ingredients. Even more exacting recipes are used for the variety of ‘veterinary’ diets we stock, nutritious foods for the prevention or treatment of certain diseases.