When to switch kitten to adult cat food

At 6 months your kitten is right in that sweet spot where a lot of owners start wondering whether it's time to make the switch to adult food — and the honest answer is: not yet, but you're smart to be thinking about it now. Kittens have very different nutritional requirements from adult cats — higher protein, more calories, and specific nutrients for bone and muscle development — and this phase is critical for setting up long-term health. Before I give you a clear steer, can you tell me what you're currently feeding her, and whether she's been spayed yet? That second bit actually matters quite a lot for the timing.

Really useful to know, thank you. The spay appointment actually changes things a little — once she's been spayed, her calorie needs drop noticeably, and if you stay on high-calorie kitten food for too long after that, weight gain can creep up quite quickly. But here's the key thing: Domestic Longhairs are a standard-sized cat, so she'll reach her adult size somewhere between 12 and 18 months. That means she genuinely needs kitten nutrition until she's around 12 months old, regardless of the spay. The move to adult food should happen after spaying and closer to that 12-month mark — not now. Are there any other concerns at the moment, like coat condition, digestion, or appetite?

Completely the right instinct — consistency matters a lot at this age, both for digestion and for making sure she's actually getting what she needs rather than a lucky dip of nutrients. Given she's 6 months, not yet spayed, and a standard-sized domestic cat, I'd move her onto Royal Canin Kitten dry food as your daily staple. It's formulated specifically for kittens up to 12 months, with the right protein levels and a nutrient profile that supports bone development and immune system maturation. The kibble size is also designed for small mouths, which matters more than people realise. Keep the wet food alongside it if she enjoys it — that's fine and actually helps with hydration — but use Royal Canin Kitten as the base. Then, around a month after her spay and once she's heading toward 12 months, you'd transition her to Royal Canin Adult or their Sterilised formula if she's been spayed by then. That's a really clean, well-mapped path for her.

Always gradual — a sudden swap is one of the most common causes of loose stools and food refusal in cats. When the time comes, mix roughly 75% kitten food with 25% adult food for the first two or three days, then go 50/50 for another few days, then 25% kitten to 75% adult, and by day ten you're fully on the adult food. Cats are creatures of habit and their digestive systems genuinely need that runway. The good news is that if you're already on Royal Canin Kitten, moving to Royal Canin Adult is a very smooth transition because the ingredients are similar — you're just adjusting the nutritional ratios, not introducing completely foreign proteins or fillers.

You're very welcome — she sounds like she's in great hands. Royal Canin Kitten dry food is widely available on Amazon UK, usually in 2kg and 4kg bags. The 4kg is better value if she takes to it well. Good luck with the spay appointment next month, and enjoy this age — 6 months is such a brilliant, chaotic stage!