Best Cat Food for Weight Gain in Singapore (2026)
You weigh your cat on the bathroom scale, do the maths twice, and the number is still lower than last month. The spine feels sharper under your hand. She finishes maybe half her bowl, walks off, and sleeps. If that's the scene in your HDB right now, you're in the right place.
This post is the food-and-portions sibling to our deeper underweight cat food guide, which covers causes, vet checks, and red flags. Read that first if you haven't ruled out medical issues. Here, we get into the concrete part: which foods actually put weight back on a Singapore cat, how much to feed, and what a 4-week plan looks like.
What 'best cat food for weight gain' actually means
Cats aren't small dogs. They're obligate carnivores, which means their bodies are built to run on animal protein and animal fat, not carbs. A bag of "high calorie" cat food that hits its calorie count using corn, rice, or pea starch is not the same as a food that hits the same calorie count using duck fat and dark meat.
For a cat trying to gain healthy weight (muscle and a little fat, not just water weight), the food should tick four boxes:
✅ High in animal protein. Cats build and hold lean muscle from animal protein. Aim for foods where the first several ingredients are named meats, not "meat meal" or "animal by-products".
✅ Calorie-dense from fat, not starch. Animal fat carries roughly 9 kcal/g, more than double protein or carbs. Foods with visible fat content from the protein itself (duck, beef, pork) are doing this naturally.
✅ Single protein, no fillers. Sensitive guts get worse when you throw five proteins and a bag of grains at them. Single-protein recipes are easier to digest and easier to troubleshoot.
✅ AAFCO complete for All Life Stages. "Complete and balanced" means the food carries the full nutrient profile a cat needs, not just calories. More on what AAFCO actually means here.
A lot of "weight gain" kibble in Singapore pet stores is just calorie-padded with carbs. That puts weight on, but often as fat around the belly, not muscle along the spine. Not the same outcome.
The proteins that work best for weight gain
Not every protein is equal for a cat trying to put weight back on. Here's how the four single-protein recipes in our cat range stack up if your goal is weight gain:
Duck (our pick for most underweight cats)
Naturally fatty, rich in animal fat, and one of the most palatable proteins for fussy cats. Duck is our newest protein for cats and it's the one we point most weight-gain pawrents to first. Cats who've turned their nose up at chicken for weeks will often dive straight into duck.Beef
Denser and richer than chicken. Higher calorie per gram than chicken, with a strong aroma that helps kickstart appetite in cats who've been picking at food.Kangaroo
Lean, hypoallergenic, and useful if the underweight cat also has known protein sensitivities. Kangaroo is the protein we recommend when chicken or beef has historically caused stomach upset. It's not the fattiest option, but if a cat's gut tolerates it, weight follows.Chicken
The gentlest starting point. If your cat has been on kibble for years and you don't know how her gut will react to fresh food, start here for the transition, then layer in duck or beef once she's stable.All four are 95% whole animal protein, single protein, no vegetables (cats don't need them), and gently cooked sous vide at 80°C so taurine and heat-sensitive vitamins survive. The full recipe sheet is open on our formulas page if you want to read every gram before you buy.
How much to feed for healthy weight gain
The standard adult cat baseline at The Bon Pet is 65g per meal, twice a day (about 130g total) of gently cooked food. That's the maintenance portion for a cat at a healthy weight.
For a cat who needs to gain weight, you've got two levers:
Lever 1: Add a third meal. Three meals of 65g (195g/day) instead of two. Cats are grazers, and an underweight cat will often eat more total food across three smaller meals than two larger ones. This is the lever to pull first.
Lever 2: Bump portion size. If she's clearing three meals comfortably, push to 75-80g per meal. Watch the litter tray. Loose stool means you've moved too fast.
A safe rate of weight gain for adult cats is roughly 1 to 2% of bodyweight per week. So a 3kg underweight cat gaining 30 to 60g a week. Faster than that and you're either rehydrating a dehydrated cat (fine, but it's not real weight) or laying down fat too quickly.
For kittens, the rules are different. Kittens are still growing and our standard recommendation is 65g × 3 meals/day baseline. If a kitten is underweight, talk to your vet before scaling further, because failure to thrive in kittens can have causes you don't want to feed through.
Most pawrents find it easier to estimate by calorie target than by gram. Run your cat's current weight, ideal weight, and activity level through our feeding calculator for a starting number, then adjust by what the scale and stool tell you.
The 4-week weight gain plan
This is what we walk pawrents through over WhatsApp when they message us about a thin cat. Assumes your vet has ruled out hyperthyroidism, kidney issues, IBD, and dental pain. If those haven't been checked, stop here and go to the vet first.
Week 1: Transition + appetite reset
- Days 1-2: 25% Bon Pet chicken / 75% current food
- Days 3-4: 50/50
- Day 5+: 100% Bon Pet
- Serve at room temperature, never reheat (heat destroys taurine)
- Three meals a day, 50g each to start
Week 2: Introduce the calorie-dense protein
- Switch one of the three daily meals from chicken to duck or beef
- Portion: 65g × 3 meals
- Weigh your cat at the start of the week, same time of day, same scale
Week 3: Push portion if tolerated
- All three meals duck or beef (or split between the two)
- Portion: 70 to 75g × 3 meals
- Stool should be firm and well-formed. If not, hold at 65g.
Week 4: Hold or layer in kangaroo
- If weight gain is on track (1-2%/week), hold here. This is her new baseline until she's at target weight.
- If gain has stalled, add kangaroo as a fourth rotated protein. Variety often re-triggers appetite in cats who plateau.
What to skip
A few things we get asked about that don't earn their place in a weight-gain plan:
Cream, milk, butter. Most adult cats are lactose intolerant. You'll get diarrhoea, not weight.
Human baby food. Some brands contain onion powder, which is toxic to cats. Don't risk it.
Tuna in oil from the supermarket. Too high in mercury for daily feeding, and not nutritionally complete. Fine as an occasional appetite-booster on top of complete food, not as the meal.
"Weight gainer" supplements. Most are flavoured carb gels. If the base diet is right, you don't need them.
Kibble alone. Even high-calorie kibble runs at single-digit moisture. Singapore is hot and humid, our cats already run mildly dehydrated, and dehydrated cats eat less. Fresh food sits around 70% moisture, which is closer to what a cat would naturally consume. More on the difference in our kibble vs fresh cat food guide.
A real example
From Jia Wei, pawrent to Mochi: "My cat Mochi has a sensitive gut. We tried 6 brands, all ended in throw-up. Kangaroo from Bon Pet is the first food she's eaten consistently for 4 months straight. Life changing."
Consistent eating is half the weight-gain battle. A food that doesn't trigger vomiting wins over a higher-calorie food that does.
Try a trial pack before you commit
The honest answer to "which protein will my cat gain weight on?" is: probably duck, possibly beef, sometimes kangaroo, and you find out which one in about a week.
Our cat trial pack gives you all four proteins (chicken, beef, duck, kangaroo) in 200g packs so your cat can show you what works before you subscribe. Intro savings apply at checkout for first-time pawrents.
If you want a hand putting together the plan, message us on WhatsApp with your cat's current weight, age, and what she's eating now. We'll work the portions out with you.
❤️ The Bon Pet team
Frequently asked questions
What can I feed my cat to gain weight quickly?
Feed a high-protein, high-fat single-protein fresh food in three meals a day instead of two. Duck and beef are the highest-calorie proteins in our range. Aim for 65g three times daily (around 195g total) and target 1 to 2% bodyweight gain per week. Always rule out medical causes with your vet first.
Is wet food or kibble better for an underweight cat?
Wet or fresh food is better for most underweight cats. It's higher in moisture (around 70% vs single-digit % in kibble), which matters a lot in humid Singapore, and it's typically more palatable for cats with low appetite. Calorie-dense fresh food also delivers more useable calories from animal fat rather than carb fillers.
How long does it take for a cat to gain weight on fresh food?
Most cats start gaining 1 to 2% of bodyweight per week once they're fully transitioned and eating three meals consistently. For a 3kg cat that's 30 to 60g a week. Visible change in body condition usually shows by week 3 to 4, with coat and muscle improvement by week 6 to 8.
Can kittens use a weight-gain feeding plan?
Kittens already eat more frequently (three meals at 65g baseline) and grow fast naturally. If a kitten is underweight or failing to thrive, see your vet before adjusting food, because the causes can be congenital or infectious and need treatment, not just more calories.
