At what age does my cat reach its adult size?


Measured at the withers, the adult size of a cat or a cat varies depending on the breed of animal. It is reached when the growth of the little feline is completely completed. It coincides with the age of sexual maturity. This is why not all cats reach their adult size at the same age, especially since this final size is impacted by various factors. Let’s take stock and also see what questions to ask if a cat’s growth appears to be stunted.

The adult size of a cat depends on its breed

There are large breed cats and others that in adulthood will not be so large. And not all cats reach their adult size at the same age. You should therefore know that small breed cats reach their final size at about 9 months, and generally do not exceed 23 cm at the withers. a large breed cat for example, measures at least 35 cm at the withers once adult (some exceed 44 cm) but it does not reach its final size until the age of 20 months on average (and more precisely between 18 and 24 months) because its growth takes longer. The difference is therefore… significant!

Among the largest breeds of cats are the Norwegian Cat, the Siberian, the Maine Coon, the Highlander Lynx as well as the Savannah and the Ragdoll.

For your information, on average a female cat becomes pubescent between 6 and 12 months and a male cat between 6 and 10 months. We must therefore take these data for what they are, that is to say averages, and each must take into account several determining factors to have an idea of ​​the size that his kitty or her kitty will reach at the adulthood. You should know that two cats do not necessarily reach the same Level of development at the same age. So no need to panic if the kitty born on the same day as the neighbor’s looks tiny next to his fellow creature. No doubt they are not of the same sex or do not belong to the same feline breed.

How do I know if my cat is finished growing?

Veterinarians advise owners of regularly weigh their cat during its growth period. The weight curve increases steadily until the little feline has reached the age of sexual maturity, and it gains around 90-100g per week. Thus, when its weight stabilizes, that is to say when the cat is no longer gaining weight, it is a sign that its growth is complete. It can then be measured at the withers. The number of centimeters obtained will no longer increase.

When growth is complete, the cat presents signs of behavior very specific such as, for example, urine marking, decreased interest in gambling, the desire to wander, repeated running away in order to find one’s sexual partner. All of this can be avoided of course through sterilization.

Impact of sterilization on the adult size of a cat (of a female cat)

Sterilization has an impact on the growth of a cat because it acts on the production of testosterone and estradiol, from sex hormones on which depends bone growth. It is therefore quite possible that a cat (or a cat) sterilized very young, that is to say well before the age of puberty, may experience a period of growth a little longer than in the case of of an unsterilized cat. Consequently, it can be noted that some sterilized cats have a moderately larger adult size than their unsterilized counterparts belonging to the same breed. The difference is not huge, and it is not systematic.

In any case, the time is right for encourage cat owners to sterilize their pets soon enough, either before puberty, because it protects their health and prevents unwanted litters. However, it is undesirable for a cat or female to be sterilized before the age of 3 months. Ideally, the kitten should have reached theat least 4 months old to undergo this type of intervention.

Why is it important to monitor the growth of your cat?

From birth until reaching adulthood, the little feline needs special care. We know that certain factors have an influence on its development. Thus, when we see that the little feline stagnates in terms of weight or size while he is still an immature cat, he is fundamental and urgent of consult the vet.

Perhaps he does not benefit from a living environment that meets his needs. Is he rejected by his mother? If he is weaned, is the food he receives adequate? Is the kitten sick? Is he getting enough sleep and is his sleep of good quality? These are all questions to ask if the kitty seems not to develop normally. Only the veterinarian can answer them during a thorough consultation and give the owner of the animal all the advice to follow so that the cat’s growth is harmonious.