Senior cat food for 13-year-old Somali switching from grain-free

Transitioning a 13-year-old Somali off grain-free adult food to a senior formula is a smart move — as cats age, kidney health becomes the priority, which means you want controlled phosphorus, good-quality protein, and ideally more moisture from wet food. Grains aren't the enemy here; in fact, for a senior cat they can actually be easier on the kidneys than some of the high-meat-dense grain-free recipes. The right senior formula really does depend on what's going on with your cat though. How old is your Somali exactly, do they have any diagnosed conditions like early kidney disease or hyperthyroidism, and what grain-free food are they currently on?

That's exactly the right mindset. Orijen Adult is very high protein and high phosphorus — great for a young adult cat, but at 13 you really do want to start dialling that phosphorus back before the kidneys have to work harder than they should. The switch to a senior formula now, while her bloods are still clean, is genuinely the best time to do it. A couple of quick questions: is she currently eating only dry, or would you consider introducing wet food alongside? And does she have good teeth — any issues with chewing?

Good teeth make the transition easier. At 13, moving to at least some wet food is genuinely worthwhile — cats are notoriously poor drinkers and kidney function benefits a lot from that extra hydration. My recommendation would be Royal Canin Ageing 12+ in wet pouches. It's formulated specifically for cats over 12, with controlled phosphorus, moderate protein at a level that's kind to the kidneys, and a texture most cats take to well even if they've been dry-fed. The protein sources include grains — which you're actively looking for — and the formula supports both kidney and digestive health in older cats. You can transition slowly over two weeks, mixing it in alongside her Orijen and gradually increasing the wet proportion. Royal Canin Ageing 12+ wet pouches are easy to find on Amazon UK. If she flat-out refuses wet after a fair trial, the Royal Canin Ageing 12+ dry is a solid backup, but give the wet a proper go first.

That's a really common concern and honestly it's mostly marketing noise. Cats don't have a biological need to avoid grains — the grain-free trend was largely driven by human food preferences being projected onto pets. Grains like rice and maize in a well-formulated senior food are perfectly digestible for cats and, as I mentioned, can actually reduce the phosphorus load compared to very high-meat recipes. The one caveat is if a cat has a confirmed grain allergy or intolerance, but that's rare and she's shown no signs of it. After three years on Orijen with no digestive issues, a gradual transition to Royal Canin Ageing 12+ should be straightforward. Go slow — about two weeks — and watch for any loose stools, which would just mean slowing the transition down a bit more.

Great choice. Start with about 25% new food mixed in for the first few days, then 50% by the end of the first week, and full switch by week two. If she turns her nose up at the wet initially, try warming it slightly — just 10 seconds in the microwave — which releases the smell and tends to win over dry-food converts. Given her clean bill of health at 13, you're in a really good position to keep her that way. Worth asking your vet to run a kidney panel at her next annual check just to have a baseline on file.