RagaMuffin nutrition: keeping a large, placid cat lean

RagaMuffins are big, slow-growing and placid, and that combination shapes how to feed them. This heavy-boned cat can take up to four years to reach full growth, according to the Cat Fanciers' Association. Mature males reach up to about 9 kg (20 lb), females closer to 7 kg (15 lb). A calm cat that size needs fewer calories than its frame suggests, and its thick coat hides fat well. Most feeding decisions for the breed come back to keeping it lean.

Calories by body weight

The usual starting estimate is the resting energy requirement (RER), which in kcal a day is 70 times body weight in kilograms raised to the power 0.75. For cats, the Merck Veterinary Manual multiplies that by 2.5 for kittens, 1.4 for intact adults, 1.2 for neutered adults and 1.0 for adults prone to obesity. The figures below are rounded to the nearest 5 kcal.

If the cat is already heavy, use its ideal weight, not its current one. A growing 3 kg kitten works out at about 400 kcal a day. Cats of the same weight can differ in their needs, and a neutered, mostly indoor RagaMuffin that sleeps much of the day may sit nearer the lower columns. Start from the table and let monthly weigh-ins decide.

Because the breed matures so slowly, owners often ask whether to keep a RagaMuffin on kitten food for years. We found no evidence that it needs a growth diet beyond the first year. Growth foods are made for a kitten's higher energy needs, and a neutered young cat with a placid temperament can put on fat quickly eating one, so bring up the switch at the one-year check. Whatever the food, the label should say complete and balanced for the cat's life stage. For adult maintenance, AAFCO sets a minimum of 26% protein on a dry matter basis.

Keeping a placid cat lean

Body condition is harder to judge in this breed than in most. The breed standard calls for a fatty pad on the lower abdomen, so a swinging belly is normal and does not by itself mean the cat is overweight. The long coat also hides the outline of the waist. Check with the hands instead: the ribs should be easy to feel under a light covering, and there should be a gentle tuck behind them when the cat is felt from above.

• Weigh monthly. Use a baby scale, or weigh yourself holding the cat and subtract. In a cat this size, a gain of a few hundred grams over some months is an early warning.
• Measure food by weight. A kitchen scale is more accurate than a scoop, and small errors add up in a cat that needs only a few hundred kcal.
• Feed meals rather than leaving food out all day. Two or more measured meals, or the day's ration split across timed feeders, make intake easier to control.
• Make the cat work for some of it. Puzzle feeders, treat balls and kibble hidden in several places add movement to the day and slow a fast eater.
• Count treats. They come out of the daily total, not on top of it.

If a cat needs to lose weight, plan it with the vet. Cats that stop eating or lose weight too fast can develop hepatic lipidosis, a serious liver condition, so crash diets are unsafe.

Heart and kidney disease

RagaMuffins are generally sturdy cats, and the breed has no specific genetic diseases of its own. Two heritable conditions seen across many cats can still turn up, hypertrophic cardiomyopathy (HCM) and polycystic kidney disease (PKD), and genetic testing of breeding cats helps keep both in check.

Hypertrophic cardiomyopathy

HCM thickens the walls of the heart's main pumping chamber. It is more common in several breeds, including the Ragdoll, the breed the RagaMuffin was developed from. Many affected cats look healthy. Others breathe fast or with effort, grow lethargic, or throw a blood clot that brings sudden pain or paralysis in the hind legs, and those signs need an emergency vet. Diagnosis is by echocardiography. Genetic test results need careful reading, since not every cat with a mutation develops the disease.

Diet matters less here than is often claimed. Cats do need taurine, but a shortage causes dilated cardiomyopathy, a different heart disease, and every complete cat food contains it. We found no study showing that extra taurine or fish oil prevents HCM. Heart supplements belong in a treatment plan from the vet, not in a healthy cat's bowl.

Polycystic kidney disease

In PKD, fluid-filled cysts gradually replace kidney tissue. Many cases in cats come down to a single PKD1 gene variant, and it is present in RagaMuffins. Testing has helped. In a large Japanese dataset of genetically tested cats, the share of RagaMuffins carrying the variant fell by more than half between 2019 and 2022, after routine testing of kittens began. When buying a kitten, ask to see the parents' PKD results.

A cat without kidney disease needs no special diet. Wet food or added water raises total water intake, which many owners and vets prefer for cats generally. If blood or urine tests do show kidney disease, the vet may recommend a prescription kidney diet. These are formulated differently from ordinary food and should only be started on veterinary advice.

The long coat and hairballs

A RagaMuffin's coat tends to resist tangles, but it is long and dense, and long-haired cats may be more prone to hairballs. Daily brushing and combing is the main prevention, because it removes loose hair before the cat swallows it. Even then, bringing up a hairball once every week or two is not unusual.

Occasionally one blocks the stomach or intestine. A cat that is lethargic, refuses food for more than a day or two, or retches or vomits repeatedly without bringing anything up should see a vet without delay. Frequent hacking may not be hairballs at all, since asthma and gut disease can look similar. Do not give laxatives, or rely on diets that claim to clear an obstruction, without a vet's approval.

Vitamin D, treats and risky foods

Living indoors does not change a RagaMuffin's vitamin D needs. Cats have very little of the skin compound that sunlight converts to vitamin D, so they depend on food for it whether they live indoors or out. A complete diet supplies enough, and extra supplements risk overdose.

Salty, fatty scraps such as deli meat and cheese add calories a placid cat does not burn. Onions, garlic, chocolate, grapes and alcohol are among the familiar toxins, and two more foods cause problems. Milk and other dairy can bring on diarrhea, because pets have little lactase, the enzyme that digests milk sugar. Some raw fish contains thiaminase, an enzyme that destroys vitamin B1. Cooking destroys the enzyme, but raw fish fed often can cause thiamine deficiency, which in cats affects the nervous system.

Sources

1. RagaMuffin. The Cat Fanciers' Association.
2. Nutritional requirements of small animals. Merck Veterinary Manual.
3. Hypertrophic cardiomyopathy. Cornell Feline Health Center.
4. Widespread genetic testing controls inherited polycystic kidney disease while avoiding inbreeding in cats. BMC Genomics, 2026.
5. The danger of hairballs. Cornell Feline Health Center.
6. People foods to avoid feeding your pets. ASPCA.