Why you should weigh your cat every month

Your cat’s weight is one of the most important indicators of her well-being. Weighing her once a month can help you catch health problems early on.

Did you know that your cat’s weight is one of the most important clues to her state of health? Weight loss or gain can be an early warning sign of illness, but if it happens gradually it can be difficult to recognize. Annual or bi-annual weigh-ins at your cat’s wellness exam may not be enough to catch these changes, so weighing your cat once a month at home can help prevent problems from going undetected until they’re in more advanced stages.


You may have seen those charts that encourage you to monitor your cat’s weight by assessing body shape and muscle condition. While these charts are useful tools and work well to determine whether your young or middle-aged cat is at an ideal weight, and while muscle condition is an important indicator of body condition, they have their limitations, especially in older cats. “You will find fat cats with low muscle condition scores,” says feline veterinarian Dr. Elisabeth Colleran, “and you will start feeling bones in cats that are still overweight if they’re starting to lose muscle mass.”


“Nearly all chronic diseases that creep up on cats cause insidious weight loss,” says Dr. Andrea Tasi, a holistic veterinarian. In fact, she considers weight the fourth vital sign. “Temperature, pulse, and respiration are very valuable for assessing any patient in an acute situation, but for really tracking the chronic health status of a cat over time, there is nothing more valuable than weight.”

Weight changes can be subtle

The average cat weighs ten pounds. A weight loss of 6% is considered a clinical sign — that’s less than ten ounces! Add this to the fact that your cat’s body is covered in fur, and subtle weight changes can be almost impossible to notice by even the most dedicated cat parent.

Conditions such as diabetes, kidney disease, hyperthyroidism, gastrointestinal issues, and cancer all cause weight loss, often at a slow and gradual pace, so that by the time a cat parent notices it, the disease may already be in its advanced stages.

If you are weighing your cat every month, however, you will pick up on this trend long before your cat may show any other symptoms. A cat who is losing weight with no change to her diet or exercise levels requires veterinary attention as soon as possible.

Monitoring your cat’s weight is also important after you’ve received a diagnosis of illness from your veterinarian. Alerting your veterinarian to weight changes in between appointments will allow him or her to adjust treatment plans and medications or perform additional diagnostics if needed.


A common recommendation is to weigh yourself on a human scale, then weigh yourself while holding your cat and subtracting the difference. Another method that is often suggested is to weigh your cat’s carrier, then weigh it with the cat inside and again subtract the difference. However, neither of these will yield results that are accurate enough.

The best way to weigh your cat is to purchase an inexpensive digital scale designed for babies, available at many retail stores or online. These scales measure pounds and ounces accurately and are easy to use. Since most cats will be suspicious if they’re lifted off the ground and onto a scale, the best thing to do is set the scale on a hard floor (it won’t read accurately on carpet) and let your cat slowly and gradually get used to it before actually placing her
on it. You don’t want her to associate being weighed with something unpleasant, so be patient.

“Weighing your cat regularly lets you notice the little losses or gains that you might otherwise not notice,” says Dr. Tasi. By checking your kitty’s weight once a month and keeping a written record of it, you can track any changes over time and catch potential issues before they become serious problems.

Keeping track of weight to avoid obesity

While gradual weight gain is somewhat less worrisome than gradual weight loss, cat parents often wait too long to intervene when their felines get overly heavy.

Packing on too many pounds has major health consequences, including diabetes, arthritis and joint problems, heart and respiratory conditions, gastrointestinal and digestive issues, compromised immunity, and increased risk for problems during anaesthesia and surgery.

Weighing your cat every month lets you keep track of any gradual but steady weight gain, and can help you and your vet come up with a plan to prevent obesity and its associated health problems.

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