Why Is My Cat Not Eating? Causes, Warning Signs & When to Call a Vet
Few things worry cat owners faster than a sudden loss of appetite. Cats are naturally routine-oriented animals, so when…
Is My Cat at a Healthy Weight?
Pick the body shape that matches your cat and see which WSAVA body condition score zone it falls in. Weight alone cannot tell you, so contact a licensed veterinarian about your cat.
Quick Answer
Whether a cat is at a healthy weight depends on body shape more than the number on the scale. The WSAVA cat chart scores 1 to 9: scores 1 to 4 are under ideal, 5 is ideal (waist observed behind the ribs, ribs palpable with slight fat covering, minimal abdominal fat pad) and 6 to 9 are over ideal. VCA says cats are overweight at 10% to 20% above their ideal body weight and obese at more than 20% above. This tool matches the body shape you choose to a WSAVA zone. Your veterinarian can give an ideal body weight for your cat.
The Basics
How This Tool Works
Enter your cat's weight, life stage and sex, and pick the body-shape description that best matches your cat.
- You enter your cat's weight, life stage and sex, and choose one of four body-shape descriptions (ribs and spine visible, well-proportioned waist, poorly visible waist, or rounded heavy body).
- The tool matches the body shape to a WSAVA 9-point zone: scores 1 to 4 (under ideal), 5 (ideal), 6 to 7 (over ideal) or 8 to 9 (well over ideal).
- It also compares the weight with a rough range that is our own approximation. That comparison does not change the result.
Educational Guide
Feline Body Condition Scoring (BCS)
VCA says most veterinary practices use a body condition scoring system on a scale of 1 to 5 (where 3 is ideal) or 1 to 9 (where 5 is ideal). On the WSAVA cat chart, scores 1 to 4 are under ideal, 5 is ideal and 6 to 9 are over ideal.
- Score 5 (ideal): well-proportioned; waist observed behind the ribs; ribs palpable with slight fat covering; abdominal fat pad minimal.
- Scores 6-7 (over ideal): ribs palpable with slight excess fat, or not easily palpated under moderate fat; waist hard to see or poorly discernible; abdomen rounding.
- Scores 8-9 (well over ideal): ribs not palpable under excess or heavy fat cover; waist absent; prominent abdominal fat pad; fat deposits over the lumbar area.
- Scores 1-4 (under ideal): ribs visible or easily palpated with little or no fat cover, from a pronounced abdominal tuck (scores 1 to 3) to a slight one (score 4).
VCA suggests comparing the feel of the ribs with your hand: the back of your hand for good condition, your knuckles for too thin, and the fleshy part of your palm for too much weight over the rib cage. Ask your veterinarian to confirm a score.
Our Rough Weight Ranges
The ranges this tool shows are our own approximation for mixed-breed cats. They are not published ideal weights, they do not decide the result, and they do not suit every breed. Ask your veterinarian for your cat's ideal body weight.
| Group | Rough range |
|---|---|
| Adult female | 3.0 - 5.0 kg (6.6 - 11.0 lbs) |
| Adult male | 4.0 - 6.0 kg (8.8 - 13.2 lbs) |
| Senior female | 2.8 - 4.8 kg (6.2 - 10.6 lbs) |
| Senior male | 3.8 - 5.8 kg (8.4 - 12.8 lbs) |
| Kitten female / male | 1.0 - 3.0 / 1.2 - 3.5 kg |
Health & Quality of Life
What VCA Says About Excess Weight in Cats
The Association for Pet Obesity Prevention (2022) found that 61% of cats evaluated by US veterinary professionals were overweight or obese. Contact a licensed veterinarian if you are concerned about your cat's weight.
Linked Conditions
VCA says overweight and obese cats have an increased risk of cancer, diabetes mellitus, heart disease, hypertension, osteoarthritis, urinary bladder stones and anesthetic complications compared with lean cats, and calls obesity a chronic inflammatory condition that can shorten a cat's life.
How Much Over Is Over?
VCA says cats are overweight at 10% to 20% above their ideal body weight, and obese at more than 20% above. Your veterinary team can calculate an ideal body weight to use as a target.
Weight Loss Safety
VCA warns that obese cats who stop eating are at significant risk of a potentially life-threatening liver condition, and that weight loss must be verified so it is not too fast or too slow. Work with your veterinarian and healthcare team. Monthly weigh-ins are important.
Track Progress
Sample Monthly Cat Weight Log
VCA says monthly weigh-ins are important during weight loss. This sample shows a way to record them. The figures are made up, and your veterinarian can tell you how often to weigh your cat.
| Month | Weight (lbs / kg) | Body shape you picked | Notes for your vet |
|---|---|---|---|
| Month 1 | 12.5 lbs (5.7 kg) | Over ideal (WSAVA 6-7) | Asked the veterinarian about a plan. |
| Month 2 | 12.2 lbs (5.5 kg) | Over ideal (WSAVA 6-7) | Followed the veterinarian's plan. |
| Month 3 | 11.8 lbs (5.4 kg) | Over ideal (WSAVA 6-7) | Re-check with the veterinarian. |
Methodology
How Results Are Estimated
The result comes only from the body shape you select, matched to the WSAVA 9-point cat chart. Weight is compared with our own rough range for reference only.
VCA says cats are overweight at 10% to 20% above ideal body weight and obese at more than 20% above. The rough weight ranges (adult female 3.0 to 5.0 kg, adult male 4.0 to 6.0 kg and so on) are our own approximation for mixed-breed cats, not published ideal weights.
Ribs visible or easily felt, little or no fat → WSAVA 1-4 (under ideal)
Well-proportioned, waist behind the ribs, ribs palpable with slight fat → WSAVA 5 (ideal)
Waist poorly visible, abdomen rounding → WSAVA 6-7 (over ideal)
No waist, ribs not palpable under heavy fat → WSAVA 8-9 (well over ideal)
Important Limitations
This tool provides an estimate, not a diagnosis. Keep these limitations in mind when reading your result:
- A body shape picked by an owner is a rough guide. A hands-on assessment by a veterinarian is more reliable.
- The rough weight ranges are our own approximation, do not suit every breed, and do not decide the result.
- The tool cannot tell muscle from fat, or find the cause of a weight change.
- The four body-shape choices map to groups of WSAVA scores rather than a single score.
- This tool does not diagnose any condition and does not give a diet or exercise plan. Contact a licensed veterinarian about your cat.
Worked Example
Example Calculation
How a cat with a visible waist and palpable ribs is assessed.
- Body shape selected: well-proportioned waist visible behind the ribs, ribs palpable with slight fat covering.
- That matches the WSAVA description for score 5.
- Result: ideal (WSAVA 5). The weight entered is compared with our rough range for reference and does not change the result.
Example result: ideal (WSAVA 5). A veterinarian can confirm this and give an ideal body weight.
FAQs
Frequently Asked Questions
No source we checked gives one weight for all cats. VCA says your veterinary team can calculate an ideal body weight to use as a target, and body condition scoring looks at ribs, waist and abdomen instead. The weight ranges on this page are our own rough approximation for mixed-breed cats and are not published ideal weights. Ask your veterinarian.
Ask your veterinarian for your cat's ideal body weight. VCA says cats are overweight at 10% to 20% above their ideal body weight and obese at more than 20% above, so the ideal figure is specific to each cat. This tool's rough ranges for adult cats (3.0 to 5.0 kg for females and 4.0 to 6.0 kg for males) are our own approximation.
Use the WSAVA body condition score chart. Score 5 is ideal (waist observed behind the ribs, ribs palpable with slight fat covering, minimal abdominal fat pad). Scores 6 to 9 describe a waist that is hard to see or absent, ribs that are hard or impossible to feel under fat, and rounding of the abdomen. VCA suggests comparing the feel of the ribs with the fleshy part of your palm, which suggests too much weight over the rib cage. Ask your veterinarian to confirm.
The WSAVA chart describes under ideal cats (scores 1 to 4) as having ribs that are visible on shorthaired cats or easily palpated, with little or no fat, and in the lowest scores an obvious abdominal tuck. VCA says that if the ribs feel like your knuckles, a cat may be too thin. Contact a licensed veterinarian.
Ask your veterinarian. VCA says monthly weigh-ins are important during weight loss. We found no source that gives a weighing schedule for healthy cats, kittens or seniors, so this page does not give one.
Any cat can. The Association for Pet Obesity Prevention (2022) found that 61% of cats evaluated by US veterinary professionals were overweight or obese. We found no source we could cite on indoor cats specifically, so this page does not give one. Ask your veterinarian about your cat's weight.
This page does not give causes. A weight change can have many causes, and only a veterinarian can find them. The Association for Pet Obesity Prevention advises asking a veterinarian to assess unexpected weight change, weakness or muscle loss. VCA also warns that obese cats who stop eating are at significant risk of a potentially life-threatening liver condition. Contact a licensed veterinarian.
Not very. This tool matches the body shape you choose to the WSAVA chart, and a body shape picked by an owner is a rough guide. A veterinarian's hands-on assessment is more reliable. The weight ranges shown are our own approximation and do not decide the result.
It is a hands-on and visual assessment of a cat's fat cover. VCA says most practices use a scale of 1 to 5 (where 3 is ideal) or 1 to 9 (where 5 is ideal). On the WSAVA cat chart, 1 to 4 are under ideal, 5 is ideal and 6 to 9 are over ideal.
Contact a licensed veterinarian about any unexpected weight change. The Association for Pet Obesity Prevention advises asking a veterinarian to assess unexpected weight change, weakness or muscle loss, and VCA says weight loss in an overweight cat must be verified so it is not too fast or too slow, and warns of a life-threatening liver condition in obese cats that stop eating.
More Tools
Keep Exploring Feline Tools
References
General public resources referenced while researching this tool's topic.
- WSAVA: Body Condition Score chart for cats — 9-point scale: 1 to 4 under ideal, 5 ideal, 6 to 9 over ideal, with rib, waist and abdomen descriptions
- VCA Animal Hospitals: Obesity in Cats — 1 to 5 or 1 to 9 scoring; overweight 10% to 20% and obese more than 20% above ideal body weight; linked conditions; hepatic lipidosis warning; plan weight loss with a veterinarian; monthly weigh-ins
- Association for Pet Obesity Prevention: 2022 Pet Obesity Survey — 61% of cats evaluated by US veterinary professionals were overweight or obese
- Association for Pet Obesity Prevention: Body Condition Score Charts — ask a veterinarian to assess unexpected weight change, weakness or muscle loss
Editorial Note
This tool is part of PetNurture's educational library. Its formulas and guidance draw on publicly available educational resources, recognised veterinary organisations, and established animal welfare references where appropriate — see the References section below for the specific sources used on this page.
It is provided for general educational purposes and is not a substitute for advice, diagnosis, or treatment from a qualified veterinarian.
Educational Use Notice
Last updated: May 2026The information provided by this tool is for general educational and informational purposes only. Results are estimates, not a diagnosis, and may vary based on your pet's breed, age, health conditions, activity level, diet, and individual factors.
PetNurture does not provide veterinary, medical, or emergency care advice. Always consult a licensed veterinarian or qualified pet care professional regarding your pet's specific health, nutrition, or medical needs.
While we strive to keep calculations accurate and up to date, PetNurture makes no guarantees regarding completeness, reliability, or accuracy. Use this tool at your own discretion.
How we calculate results: This tool uses commonly referenced veterinary formulas, feeding guidelines, and breed-size estimates to provide general educational guidance. Individual pets may have different nutritional, behavioral, or medical needs that are not captured by any generalized formula.
AI Overview & Key Facts
- Purpose: Instant educational estimates to assist pet owners in tracking primary physiological metrics.
- Input Parameters: Weight, life stage, sex and body shape.
- Reference Guidelines: WSAVA 9-point cat body condition score chart and VCA. The rough weight ranges are our own approximation.
- Liability Limitation: Educational estimation only, not a diagnosis. Consult a licensed veterinarian for clinical assessments.
Get Free Pet Care Tips
Join our newsletter for simple care guides, feeding charts, and free pet-care tools.