When is a Cat Full Grown?

With so many species being bred down into more petite sizes, it may be hard to tell when a cat is fully grown. Plus, the ultimate-size of a feline also greatly depends on the breed itself - the Munchkin only grows to approximately 8 pounds, whereas the Maine Coon is tipping the scales at around 25 pounds!

So, when is a cat full grown? Check it out!

Generally Speaking…

Cats are typically full grown at one year-of-age. But once again it will vary from breed-to-breed. Let's revisit the Maine Coon. This big fella needs anywhere from 3 to 5 years to acquire his full length and weight, whereas a typical mixed breed (moggy) may be well developed by its first year.

If you have a purebred feline, you can check the breed standards on the Cat Fancier's Association (CFA) website for more details of its size and what you can expect.

Puberty in Cats

Like all humans go through puberty, so does the feline species. This essentially is their teenage months and is usually noted by a more gangly body and never-ending curiosity to explore. This stage of a kitten's life is from 6 to 9 months-of-age, as they are also coming into sexual maturity at the same time.

It is not recommended to breed a female cat at this tender age as it is extremely difficult on her own still growing body. Males can also impregnate a female between these ages, so be sure to keep him away from any unaltered females.

Of course, spaying and neutering is always the best course of action to help decrease the unwanted pet population. Most veterinarians are comfortable altering a cat after 6 months-of-age, but check with your own vet to see what he/she prefers.

Social Maturity in Cats

At about 6 months old, your cat may go through a clingy or temperamental phase. This is just those teenage hormones kicking in; however, as he grows and matures these will settle out.

If you have your pet altered when still a kitten, this feline will usually remain playful and kitten-like, well in adulthood, showing more affection to their pet parent. On the other paw, cats that are left intact will have a higher risk of getting outside to procreate, be more moody and even aggressive, and the males may take to spraying in the home.

Adulthood in Cats

By the time most cats reach the age of 3 to 4 plus years, they are usually beginning to settle out. They will still be active, but will also take time out for a quick catnap in the sun. Healthy felines should still show a willingness to play and should be eager to chase after a cat toy or engage with its favorite human.

Mature & Senior Cats

When cats reach 7 they are considered to be around middle-age (equivalent to humans at 40 to 45). As they age they will begin to slow down. By age 11 to 14 your cat will be considered a senior citizen. These are the times when your cat will most likely sleep alot and may not want to run and chase the way he once did. Cats moving into this phase of their lives should be more closely monitored for common health conditions like arthritis and dental problems.

Depending on the individual feline, the senior years can still be filled with activity. You will know when your cat is beginning to show its own signs of becoming a senior.

Life Stages at a Glance

Here are the life stages of a cat to help you determine where your cat is at;

  1. Kitten - 0 to 6 months. Rapidly growing. Busy, curious and not sexually mature.
  2. Junior - 6 months to 2 years. Depending on your specific breed, this cat is usually full-size or on it's way to being so. It's still curious and is figuring out the world around him.
  3. Prime - 3 years to 6 years. This phase should have your cat at the peak of its health, with moderate to high energy levels.
  4. Mature - 7 years to 10 years. This cat may be taking life a bit slower, enjoying more time at rest, but still willing to play if the mood strikes.
  5. Senior - 11 years to 14 years. Depending on the general health of your feline, this phase may see more health issues, as this cat is around 70 in human years.
  6. Geriatric - 15 plus years. Most cats in this phase of their lives are sleeping most of the time. They should still want to eat, drink and engage with the pet parent in a slower manner (lying beside you on the sofa).

When Is a Cat Full Grown?

These are general guidelines to feline growth and maturity, but each kitty can be different. Some cats in the prime of their lives become lazy and want to mostly sleep, while those senior cats can still be tearing up the house. Whatever your cat's age, enjoy each phase. They are each unique and precious in their own way.

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