Healthy Weight for a Russian Blue

Weight is the single most controllable influence on your cat’s long-term health. This guide covers what a healthy Russian Blue weighs, how to assess them at home, and how to change things safely.

Typical weights

Russian Blues are a medium-sized, fine-boned breed:

• Adult females: roughly 3 to 4.5 kg
• Adult males: roughly 4.5 to 6 kg
• Kittens at 12 weeks: roughly 1.2 to 1.6 kg, varying by sex and build

Treat these as ranges, not targets. A tall, large-framed male is not overweight at 6 kg, and a petite female is not underweight at 3.2 kg. Condition matters far more than the number on the scale.

How to body condition score at home

Ribs. Run your hands lightly along the sides. You should feel ribs easily under a thin covering of fat — like the back of your hand. If you have to press to find them, they are carrying too much. If the ribs feel sharp and prominent, they are too thin.

Waist. Look from above. There should be a visible narrowing behind the ribs.

Tummy. From the side, the belly should tuck up slightly toward the hips. A sagging, rounded belly usually means excess fat.

Note that many cats have a small primordial pouch — a loose flap of skin along the lower belly. That is normal and is not fat.

If your cat needs to lose weight

• Measure food. Most owners underestimate portions. Use a cup or scale.
• Cut treats or switch to part of their daily allowance.
• Increase play — see our exercise guide.
• Use puzzle feeders to slow eating and add activity.
• Lose weight slowly. Rapid weight loss is dangerous for cats and can cause serious liver problems. Ask your vet to set a safe rate and a target.
• Consider a weight-management food — higher protein, lower calorie, and more filling.

If your cat is underweight

Unexplained weight loss always warrants a vet visit. Common causes include dental pain, parasites, kidney disease, hyperthyroidism and diabetes. Once medical causes are excluded, your vet can advise on increasing calories.

Why it matters so much

Overweight cats have shorter lives and higher rates of diabetes, arthritis, urinary problems and heart disease. Keeping your cat lean is one of the kindest things you can do for them. Our feeding guide covers portions by age.