Rabbit · Medium Breed
Flemish Giant
The Flemish Giant is one of the largest domestic rabbit breeds, known for its impressive size and calm, gentle nature. Adults commonly weigh around 15-20 pounds, and many are affectionate, social companions when given enough space, handling support, and daily interaction.
The Calculator
How old is your Flemish Giant in human years?
At 1 year old
Your Flemish Giant is approximately 8 in human years.
Field Notes
About the Flemish Giant
Flemish Giants are an old domestic rabbit breed associated with Flanders in Belgium, with roots that likely go back several centuries and more formal breed development in the 1800s. They were originally bred as meat and fur rabbits, but today they are better known as companion animals admired for their size and placid personality.
Temperament-wise, Flemish Giants are often called gentle giants because they tend to be calm, tolerant, and people-oriented. They usually do best with patient handling, quiet routines, and supervision around children, since their large bodies make unsafe lifting or sudden struggles more risky than with smaller rabbits.
Care needs are higher than many people expect because this breed requires much more floor space, sturdy housing, and soft supportive footing. A hay-based diet with measured pellets, fresh greens, clean water, regular nail trims, and close monitoring of weight, feet, appetite, and stool output are especially important to help prevent obesity, sore hocks, and digestive trouble.
Exercise needs are significant, and a Flemish Giant should have daily time outside its enclosure to hop, stretch, explore, and forage. They benefit from large safe areas, non-slip surfaces, tunnels, low platforms, and enrichment toys, because consistent movement helps maintain muscle tone, joint comfort, cardiovascular health, and a healthy body weight.
Temperament
Exercise Needs
moderate
Health Watch
- Sore hocks (pododermatitis)
- Obesity
- Gastrointestinal stasis
- Arthritis or spinal spondylosis
- Upper respiratory infections
Grooming
Flemish Giants have a dense, glossy coat that benefits from regular brushing, along with routine nail trims and periodic ear and rear-end checks to keep such a large rabbit clean and comfortable.
Growth Curve
Flemish Giant weight chart
Typical weight progression from young to adult. The tinted band marks the healthy adult range — 5–10 kg.
Nutrition, Staged
Flemish Giant Feeding Guide
Stage-based portions tuned to breed energy requirements. Use as a starting point — your veterinarian tailors the final numbers.
Formative years
Young
Follow breed-specific puppy feeding guidelines
Peak years
Adult
Follow breed-specific adult feeding guidelines
Mature years
Senior
Follow breed-specific senior feeding guidelines
Questions, Answered
On the Flemish Giant
Most adult Flemish Giants weigh about 15-20 pounds, though some individuals can be even larger. They are also very long-bodied rabbits, so they need much more room to stretch out, turn comfortably, and move around than smaller breeds.
They can be excellent family pets because they are often calm, social, and affectionate with regular gentle interaction. That said, they are best for homes that understand rabbit care and can supervise children closely, since their size makes improper handling more dangerous for both the rabbit and the person.
Yes, they need oversized housing with solid, well-cushioned flooring and enough room for several consecutive hops. Standard small rabbit cages are usually inadequate, and many Flemish Giants do better in a large pen, rabbit-proofed room, shed setup, or indoor free-roam arrangement.
Their diet should be based primarily on unlimited grass hay, with fresh leafy greens, controlled portions of quality pellets, and constant access to clean water. Because this breed can gain weight easily, sugary treats and excess pellets should be limited and body condition should be monitored regularly.
Their large size makes them more prone to sore hocks, excess weight, and age-related joint or spinal problems than many smaller rabbits. Like all rabbits, they can also develop GI stasis, so a reduced appetite, fewer droppings, or lethargy should be treated as urgent signs to contact a rabbit-savvy veterinarian.
Adjacent Breeds
