Fish-only treats matter to owners managing a cat with a meat sensitivity, or simply a cat that prefers fish to anything else, which is exactly what a genuinely single-ingredient tuna treat offers.

This treat is 100% tuna loin - nothing else in the composition - gently steam-cooked and lightly grilled. Cookhouse say it can be used daily as a treat, topper or supplement to other food. It carries protein at 29%, fat content at just 0.5%, crude fibre at 0.2%, crude ash at 1.3% and moisture at 69%.

• 30G individually packed fillet
• Composition: tuna loin 100%
• Protein 29%, fat content 0.5%, crude fibre 0.2%, crude ash 1.3%, moisture 69%
• No grains, fillers or reformed meat
• Can be fed daily, as a treat, topper or supplement

On the single ingredient. Because it's just tuna loin, there's no fibre, carbohydrate or added nutrient beyond what the fish itself provides - which is either exactly what you want from a "clean" treat, or a reason to look elsewhere if you want something more fortified.

Who it's for: owners of cats with a preference for fish over meat, or a sensitivity that rules out other proteins, who want a genuinely single-ingredient treat.