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When Is a Rabbit Fully Grown?

Have you ever wondered when a rabbit is fully grown?

It’s a joy to witness your rabbit reach its full potential in size and maturity, which is an integral part of pet ownership.

In this article, we will let you know when a rabbit is fully grown. We will also discuss rabbit growth, explore the factors influencing it, and much more.

Overview Of Rabbit Growth

Before addressing the question, we need to comprehend the various stages of a rabbit’s growth.

It starts at birth, where the average weight is about 30 to 50 grams.

They are born altricial, meaning they are hairless, blind, and dependent on their mothers for survival.

By the 10th day, the eyes open, and they move a bit.

The weaning phase begins around four weeks old, during which they gradually shift from mother’s milk to solid food.

During adolescence, around 3 to 5 months, rabbits undergo sexual maturity.

The final stage is adulthood, which leads us back to our central question.

When Is a Rabbit Fully Grown?

Rabbits typically reach their full size between 6 to 12 months, which is when they transition from adolescence to adulthood.

However, remember that this can fluctuate based on breed and individual genetics.

Some large breeds may continue growing until they are 1.5 years old.

Size Variations in Rabbit Breeds

Being diverse and versatile, Rabbits exhibit various sizes across different breeds.

Let’s examine this in more detail by categorizing rabbits into three main groups: small, medium, and large breeds, along with examples, their typical adult weight, and how these variations impact the age at which they are considered fully grown.

1. Small Breeds

  1. Netherland Dwarf Rabbit: Topping the chart of small rabbit breeds, Netherland Dwarfs weigh just 1.5 to 2.5 pounds as adults. These rabbits reach their full size quickly, usually around 4 to 6 months.
  2. Polish Rabbit: Slightly bigger than the Netherland Dwarf, Polish rabbits typically weigh around 2.5 to 3.5 pounds and are considered fully grown at about 6 months.
  3. Holland Lop: These rabbits are characterized by their lopped ears and weigh between 2 to 4 pounds. They usually attain full size around 5 to 7 months.

2. Medium Breeds

  1. Dutch Rabbit: Known for their distinctive coloring, Dutch rabbits weigh 3.5 to 5.5 pounds and reach their full size by 6 to 9 months.
  2. American Sable: This breed generally weighs around 7 to 10 pounds. Expect them to be fully grown at about 9 to 12 months.
  3. English Spot: Weighing 5 to 8 pounds as adults, English Spots are known for their attractive spots and stripes. They usually reach adulthood at about 9 to 12 months.

3. Large Breeds

  1. Flemish Giant Rabbit: As the name suggests, Flemish Giants are among the largest rabbit breeds, weighing over 20 pounds in some cases. They can continue to grow up to 18 months.
  2. French Lop: Weighing anywhere from 10 to 15 pounds, French Lops are known for their long, lopped ears. They typically reach their full size in 12 to 14 months.
  3. Giant Chinchilla Rabbit: This breed typically weighs between 12 to 16 pounds. They can take up to 12 to 18 months to fully mature.

Diet’s Role in Rabbit Growth

Feeding a growing rabbit appropriately is much like fueling a developing child – getting the diet right is pivotal for ensuring proper growth and health.

Proper nourishment not only aids in physical growth but also contributes to the rabbit’s overall well-being.

Let’s discuss the essential components of a rabbit’s diet, how these contribute to growth, and considerations for feeding during different life stages.

1. Key Components of a Rabbit’s Diet

  1. Hay: Hay is the backbone of a rabbit’s diet, especially for young and growing rabbits. It provides the necessary fiber, aids digestion, and helps wear and care for their constantly growing teeth. Alfalfa hay, rich in calcium and protein, can particularly benefit younger rabbits.
  2. Pellets: While not a replacement for hay, pellets fortified with essential vitamins and minerals can supplement a rabbit’s diet. Pellets explicitly designed for young rabbits often contain additional protein to support growth.
  3. Vegetables and Greens: Introducing fresh, leafy greens provides variety and additional nutrients. They’re a source of water and vitamins that support overall health.
  4. Limited Fruits and Treats: Though not essential for growth, small amounts of fruits and treats can be used as rewards and offer some variety. However, they should be used sparingly, as excessive sugar can lead to obesity and other health problems.

2. Feeding During Different Life Stages

  1. Newborn to Weaning (0-8 weeks): Baby rabbits depend on their mother’s milk, rich in fat and nutrients essential for growth. If hand-rearing, special care should be taken to provide suitable milk replacement.
  2. Weaning to Adolescence (2-6 months): This stage involves a gradual transition from mother’s milk to solid food. Alfalfa hay and pellets designed for young rabbits are introduced, as they contain higher protein and calcium needed for growth.
  3. Adolescence to Adulthood (6-12 months): The diet should gradually shift towards adult rabbit food. Alfalfa can be replaced with grass hay, and pellets should be reduced, focusing on a diet rich in fresh hay and vegetables.

3. Special Considerations

  • Monitoring Weight and Growth: Regular check-ups and weight monitoring help ensure the diet supports growth without leading to obesity.
  • Avoiding Sudden Dietary Changes: Sudden changes can disrupt a rabbit’s sensitive digestive system, so any transitions in diet should be gradual.
  • Individual Needs: Breed, size, activity level, and personal health all play a role in determining the optimal diet. Consultation with a rabbit nutrition expert can guide personalized feeding plans.

Health Concerns During Growth

Rabbit growth is a fascinating yet delicate process.

Observing your rabbit’s transformation from a tiny, fluffy baby into a fully grown adult can be a joyous experience, but the growth phase also comes with specific health challenges.

Understanding these health concerns allows you to care for your rabbit proactively and ensures a healthy and happy life.

Let’s examine some primary health issues that can affect rabbits during their growth phase.

1. Digestive Issues

The rabbit’s digestive system is complex and sensitive. Any abrupt changes in diet or feeding inappropriate foods can lead to digestive problems such as:

  • Gastrointestinal (GI) Stasis: This is a condition where the digestive system slows down or stops. Early signs include reduced appetite and smaller fecal pellets.
  • Enteritis: Inflammation of the intestines, often seen in weaning rabbits, can lead to diarrhea and requires immediate veterinary care.

2. Malnutrition

Improper diet can lead to malnutrition, a serious concern during growth. Lack of essential nutrients like calcium and protein can stunt growth and lead to skeletal problems.

3. Parasitic Infections

Young rabbits are susceptible to various parasitic infections, including:

  • Coccidiosis: An intestinal parasite that can cause diarrhea, lethargy, and even death if not treated promptly.
  • Ear Mites: These can cause discomfort and lead to infections if left untreated.

See this: Can an Ear Infection Kill a Rabbit?

4. Dental Problems

Rabbits’ teeth grow continuously, and improper alignment or lack of abrasive foods like hay can lead to overgrown teeth.

This can cause difficulty eating and lead to malnutrition and other health problems.

5. Respiratory Issues

Inadequate living conditions, such as poor ventilation, can lead to respiratory infections. Signs include nasal discharge, sneezing, and difficulty breathing.

6. Obesity

Though not common in growing rabbits, overfeeding, particularly with high-calorie foods like pellets and treats, can lead to obesity.

This can have long-term health impacts, including joint issues and heart problems.

7. Genetic Disorders

Some breeds are prone to specific genetic health issues. For example, lop-eared breeds may be more susceptible to ear infections.

How to Care for a Growing Rabbit

Caring for a growing rabbit is a commitment filled with joy, love, and responsibility.

As your rabbit goes through the various stages of growth, your role as a caretaker is to provide a nurturing environment that caters to its evolving needs.

From diet to socialization, each aspect requires special attention.

Here’s a guide to caring for a growing rabbit:

1. Proper Diet

As previously discussed, a rabbit’s diet is essential for its growth. Here’s how you can ensure optimal nutrition:

  • Age-appropriate Diet: Tailor the diet to the rabbit’s growth stage, such as providing higher protein for younger rabbits.
  • Fresh Hay and Water: Always have fresh hay and clean water accessible.
  • Avoid Sugary Treats: Limit sugary foods that can lead to obesity and dental problems.

2. Safe and Comfortable Housing

Creating a secure living space is necessary:

  • Adequate Space: The enclosure should provide enough space for the rabbit to move freely.
  • Cleanliness: Regular cleaning prevents diseases and creates a comfortable environment.
  • Enrichment: Include toys, tunnels, and platforms to stimulate mental and physical activity.

3. Health Monitoring

Regular health checks can prevent many problems:

  • Routine Veterinary Care: Regular vet visits will keep vaccinations up to date and catch potential health problems early.
  • Home Monitoring: Learn to check your rabbit’s teeth, ears, and weight to catch early signs of trouble.

4. Socialization and Handling

Growing rabbits are curious and social animals:

  • Gentle Handling: Teach family members and guests how to handle your rabbit gently to prevent injury.
  • Social Interaction: Spend quality time with your rabbit to foster a trusting relationship.
  • Playtime: Regular play and exploration outside the cage encourage physical exercise.

5. Grooming

Grooming needs vary among rabbit breeds:

  • Brushing: Regular brushing removes loose fur and prevents ingestion, leading to hairballs.
  • Nail Trimming: Check and trim nails as needed, or have a vet or experienced groomer do it for you.

See this: How to Keep Rabbits Nails Short Without Cutting

6. Behavior Training

  • Litter Training: Most rabbits can be litter trained with patience and positive reinforcement.
  • Chewing Behavior: Provide appropriate chew toys to satisfy their natural urge to chew and keep them away from dangerous household items.

7. Special Considerations for Specific Breeds

Some breeds have unique requirements:

  • Breed Needs: Research your specific breed for unique needs or consult a rabbit expert.


Here are some frequently asked questions on rabbit growth.

At What Age Can A Rabbit Get Pregnant?

Rabbits are known for their ability to reproduce and reach sexual maturity surprisingly early. The age at which a rabbit can become pregnant varies by breed and individual characteristics, but here is a general guide:

1. Small Breeds (e.g., Netherland Dwarfs, Mini Rex):

  • Females (Does): As early as 3 to 4 months old.
  • Males (Bucks): Capable of mating as early as 3 to 4 months old, but often more successful a bit later.

2. Medium Breeds (e.g., Dutch, Standard Rex):

  • Females (Does): Around 4 to 6 months old.
  • Males (Bucks): Usually capable of mating by 4 to 6 months.

3. Large Breeds (e.g., Flemish Giants, French Lops):

  • Females (Does): Usually around 5 to 8 months old.
  • Males (Bucks): Often mature a bit later, around 5 to 8 months.

Considerations for Breeding:

Even though rabbits can reproduce at a young age, responsible breeding involves waiting until they are fully developed physically and mentally.

Breeding too early can pose serious health risks for the doe and her offspring.

  • Physical Maturity: The rabbit should be fully grown and in good health. This typically means waiting until the doe is at least 6 to 9 months old for smaller breeds and possibly older for larger breeds.
  • Mental Maturity: It’s not just about physical readiness. Understanding the behavior and temperament of the rabbit can also be vital.

How Do You Tell How Big Your Rabbit Will Get?

Determining the eventual size of a rabbit, especially if it’s still growing, involves considering several factors.

While there’s no foolproof method to predict the exact size a rabbit will reach accurately, you can make educated guesses based on the following criteria:

1. Breed Characteristics

Different rabbit breeds have distinct size ranges. The breed of your rabbit can give you a general idea of the size it may reach:

  • Small Breeds: Often weigh 2 to 4 pounds when fully grown.
  • Medium Breeds: Typically range from 5 to 7 pounds.
  • Large Breeds: Can weigh 8 pounds or more.

2. Parental Size

If you have access to information about the rabbit’s parents, their size can indicate how big their offspring might become.

3. Observing Growth Patterns

Rabbits usually reach their full size between 6 to 12 months, although larger breeds may take longer.

You can estimate the adult size by monitoring the growth rate and comparing it to standard growth charts for the specific breed.

5. Assessing Bone Structure

Sometimes, the size of the rabbit’s bone structure, particularly the width of the skull and the size of the feet, can indicate the eventual size.

When Are Lop Rabbits Fully Grown?

Lop rabbits, renowned for their distinctive drooping ears, come in various breeds and sizes.

When a Lop rabbit is fully grown depends on the specific breed and several other factors.

Here’s a detailed overview:

1. Mini Lop Rabbits:

  • Full Growth Age: Usually around 6 to 7 months.
  • Adult Weight: Typically weighing between 4.5 to 6 pounds.

2. Holland Lop Rabbits:

  • Full Growth Age: Reaching full size around 4 to 6 months.
  • Adult Weight: Generally ranging from 2 to 4 pounds.

3. French Lop Rabbits:

  • Full Growth Age: These larger Lop rabbits may take 9 to 12 months to reach full size.
  • Adult Weight: They can weigh 10 to 15 pounds or even more.

4. English Lop Rabbits:

  • Full Growth Age: English Lops grow fully by 6 to 9 months.
  • Adult Weight: They typically weigh between 9 to 12 pounds.

What Age Are Lionhead Rabbits Fully Grown?

Lionhead rabbits are a distinct and popular breed, known for their mane of fur around their head that resembles a lion’s mane.

Let’s detail its growth:

Growth Stages of Lionhead Rabbits

  • Birth to 3 Months: During this period, Lionhead rabbits are in their initial growth phase, and their diet primarily consists of mother’s milk and slowly introducing hay and pellets.
  • 3 to 6 Months: This stage sees a significant growth spurt, and the diet shifts more towards solid foods, including fresh vegetables.
  • 6 to 7 Months: By this time, many Lionhead rabbits reach full size, though some might continue growing slowly for a bit longer.

Adult Size of Lionhead Rabbits

  • Weight: Fully grown Lionhead rabbits typically weigh around 2.5 to 3.75 pounds, though some individuals might be slightly heavier or lighter.
  • Physical Appearance: The lion-like mane becomes more pronounced as they grow, adding to their unique appeal.

When Are Rex Rabbits Fully Grown?

Rex rabbits are known for their plush, velvety fur and gentle temperament.

Here’s a detailed overview of their growth:

Growth Stages of Rex Rabbits:

  • Birth to 3 Months: During this initial stage, Rex rabbits are nursing and starting to explore solid foods, mainly hay and specialized pellets.
  • 3 to 6 Months: The rabbits experience a significant growth spurt during this phase, with further introduction to a balanced diet, including fresh vegetables.
  • 6 to 9 Months: Most Rex rabbits will be near their adult size by this stage, but growth might continue for another month or two, especially in larger individuals or specific lines.

Adult Size of Rex Rabbits:

  • Standard Rex: Fully grown Standard Rex rabbits typically weigh between 7.5 to 10.5 pounds.
  • Mini Rex: A smaller breed variant, rabbits usually weigh between 3 to 4.5 pounds when fully grown.


So, when is a rabbit fully grown? Typically, they reach full size between 6 to 12 months.

However, breed size and individual genetics can cause variations.

Factors like diet and health status can also influence growth.

As rabbit enthusiasts, understanding these aspects allows us to provide the best care possible for these delightful creatures, ensuring they mature healthily and happily.

We hope this article helped you know when a rabbit is fully grown. If you have any questions, comment below, and we will answer them.

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