Full Grown Runt Cat: Size, Lifespan, Price & More

Are you considering adopting a runt cat but not sure what to expect when it's fully grown? This guide covers everything you need to know about a runt cat's size, appearance, personality, health, care needs and more as an adult cat.

What is a Runt Cat?

A runt cat is a kitten that is significantly smaller than its littermates at birth. Runt kittens come from normal-sized litter but for various genetic or environmental reasons like poor prenatal nutrition, they experience stunted growth in the womb or as newborns.

Size at Full Grown

The size of a full-grown runt cat can vary depending on the individual, but on average, they will be smaller than a typical cat of the same breed. For example, male Siamese cats normally reach 6-8 pounds fully grown. A full-grown male Siamese runt may only reach 4-6 pounds.

In terms of length and height, runt cats also remain compact and petite. An average sized male domestic shorthair is about 15-17 inches long and 10-12 inches tall at the shoulder.

A full-grown male domestic shorthair runt would be in the range of 13-15 inches long and 8-10 inches tall.

Weight at Full Grown

The weight of a fully grown runt cat is usually 25-50% less than the typical weight range for their breed. For example:

• Female domestic shorthair: Average 8-10 lbs. Runt 5-7 lbs.
• Male Maine Coon: Average 13-18 lbs. Runt 8-12 lbs.
• Female Siamese: Average 4-6 lbs. Runt 2.5-4 lbs.

Appearance at Full Grown

In terms of appearance, full grown runt cats look like smaller, miniature versions of typical cats. They have the same coat pattern and colors as their breed. The only difference is their overall petite size and compact, diminutive frame.

Personality at Full Grown

When it comes to personality, runt cats tend to be similar in temperament to regular cats of their breed. One personality trait they often share is being highly affectionate due to a desire for attention and bonded to their owners.

They also tend to be playful, active, vocal and curious - making them entertain cats to have around. Some potential differences in personality could be a bit timid or clingy due to their small size.

Price

On average, runt kittens can be adopted for $25-50 from animal shelters. When adopting from a reputable breeder, expect to pay $100-300 depending on the breed and pedigree.

The price is usually lower for runt kittens since they are considered "non-show quality" by breed standards due to their petite size.

Food/Feeding

At full growth, feed a runt cat a high-quality diet in smaller, more frequent portions to meet their nutritional needs on a reduced calorie intake. Meal times should be divided into 3-4 portions daily.

Use a small bite-sized kibble and measure 1/4 to 1/2 cup per meal depending on the individual cat's requirements. Stay attuned to their weight and adjust portions accordingly.

Lifespan

In general, runt cats have a similar average lifespan of 12-15 years as regular sized cats when given excellent care. Some studies have found no significant difference in longevity between runts and normal kittens.

Proper nutrition, regular veterinary care and a safe, stress-free home environment are essential to optimizing their health and lifespan potential.

Health at Full Grown

With proper care, most runt cats achieve normal physical and cognitive development with no lasting health issues from their small birth size. However, some potential concerns to watch for include:

• Hypoglycemia (low blood sugar) - Monitor and supplement with nutritious food if needed
• Fragile bones - Limit rough play to prevent injury
• Dental problems - Brush teeth and monitor for early gum disease
• Eye issues - Annual eye exams to screen for pressures or ulcers

Care and Nutritional Needs

Some key aspects of care and nutrition for a full grown runt cat:

• Frequent small meals of high-quality kitten or weight management food
• Fresh, clean water available at all times
• Daily interactive play to stay fit and stimulate mind/body
• Regular wellness exams and dental care by a vet
• Grooming 2-3x week to check skin/coat and provide affection
• Indoor lifestyle for maximum safety and health protection

Costing

Overall lifetime costs of owning a full grown runt cat are relatively similar to a regular sized cat. Expense items include:

• Initial adoption/purchase fee: $25-300
• Food: $40-80 per month for high quality kitten or weight control diet
• Litter and litter box supplies: $20-30 per month
• Toys and scratching posts: $10-20 per month
• Flea/tick prevention: $5-10 per month
• Annual wellness exam and vaccines: $100-300 per year
• Unforeseen medical expenses if required

Possible Behavioral Changes

In most cases, the personality and behaviors of a fully grown runt cat remain similar to their kitten temperament. However, some changes to monitor include:

• Increased shyness/fear of strangers or other pets
• Cuddly attachment level may intensify for security
• Territory issues like spraying or hissing could emerge
• Demand more playtime to stay fit and mentally stimulated

Notable Characteristics

Here are some standout traits commonly seen in fully grown runt cats:

• Compact petite frame - Easily fit in small spaces or be lap cat
• Soft silky fur - Often thicker, fuller coats than siblings
• Bright, inquisitive eyes - Always watching surroundings
• Loud meow and purr - big sounds from little bodies!
• agility and jumping ability - Still play like kittens
• Intense bond with owner - Very loving, affectionate nature

Are Runt Cats Right for You?

In summary, with proper care, support and understanding of their needs, runt cats can thrive and live just as happily and healthily as normal kittens into adulthood. Their petite size requires some adjustments but also lends to being fun, affectionate lap companions.

If you have the time, patience and commitment to meet the special considerations of a small cat, then a full grown runt may make perfect additions to your home.