Devon Rex kitten not gaining weight?

A lean Devon Rex at four months who isn't gaining weight is something I want to dig into properly — because Devon Rex have a naturally slight, fine-boned frame, but there's a real difference between looking lean and actually failing to put on mass. Kittens have very different nutritional requirements from adult cats — higher protein, more calories, specific nutrients for bone and muscle development — and this phase is genuinely critical for long-term health. What are they eating right now, and roughly how much? And do you know their current weight?

That's really helpful. A supermarket own-brand dry food is where I'd start looking — they tend to have lower protein percentages and more filler carbohydrates than a kitten really needs, especially a Devon Rex. This breed has a fast metabolism and genuinely burns through calories quickly, so they need food that's calorie-dense and high in quality animal protein. The other thing with dry-only feeding is that it's easy for kittens to not eat quite enough volume to meet their calorie needs. Has she ever had any wet food, or is it dry only so far?

It really does at this age — wet food is calorie-rich, high in meat protein, and much easier for small kittens to eat enough of in one sitting. My recommendation for your girl is Royal Canin Kitten Instinctive wet food in the pouches. It's specifically formulated for kittens up to 12 months, with high protein from real poultry, a good calorie density, and it's very palatable — Devon Rex tend to take to it well. I'd transition her onto two or three pouches a day alongside a smaller amount of dry, rather than replacing it overnight. You should see a real difference in her condition within a few weeks. That said, given she was already flagged as low-end at 12 weeks, I'd get her weighed again soon — most vet practices will do a quick nurse weight check for free — just so you have a baseline to track against.

Not yet — and I'd genuinely hold off on supplements until you've switched the food and given it three to four weeks. Adding supplements to a poor base diet doesn't fix the underlying issue, and some supplements can actually throw off the careful nutrient balance in a complete kitten food. Royal Canin Kitten Instinctive is already formulated with the vitamins, minerals, and omega fatty acids a growing kitten needs. Get the food right first, watch her weight, and if she's still not gaining after a month on good food, that's the moment to go back to the vet and discuss whether there's something else going on — absorption issues, for example. But most kittens in this situation turn a corner quickly once the nutrition improves.

Perfect plan. Royal Canin Kitten Instinctive pouches are easy to find on Amazon UK and most pet shops. Introduce them gradually over about five days if you can — new food plus new texture at once can sometimes cause a soft stomach. She sounds like a lovely little cat and you're clearly paying close attention, which is exactly what makes the difference at this age. Good luck with the weight check!