Flemish Giants are known to be quite placid and laid-back, and often call the Gentle Giants.
Due to its large size, the Flemish needs a large space. It will require more food compared to other breeds. The Flemish Giant will only require mild attention to grooming due to its short-hair. It does molt (loose old coat) in Spring and Fall. Some grooming at that time will keep your Flemish Giant looking nice, and feel better.
Flemish Giants are the largest breed recognized by the American Rabbit Breeders Association. It is a semi-arch type rabbit with its back arch starting back of the shoulders and carrying through to the base of the tail giving a "mandolin" shape. The body of a Flemish Giant Rabbit is long and powerful with good muscular development and relatively broad hindquarters. Bucks have a broad, massive head in comparison to does. Does may have a large, full, evenly carried dewlap (the fold of skin under their chins). The fur of the Flemish Giant is known to be glossy and dense, and when stroked from the hindquarters to the head, the fur will roll back to its original position. ARBA standard has seven different colors, black, blue, fawn, light gray, sandy, steel gray and white. They are shown in six classes (three buck classes and three doe classes): Junior bucks and does under 6 months, Intermediate bucks and does 6–8 months, and Senior bucks and does 8+ months. The minimum show weight for a Senior (older than 8 months) doe is 14 lbs (about 6.4 kg), and the minimum weight of a Senior buck is 13 lbs (about 5.9 kg)(ARBA Standards of Perfection). As with other "giant" breeds, the Flemish Giant grows slowly. A senior doe can take 1 year and a senior buck can take 1.5 years to reach full maturity. It is not unusual to see a flemish over 20 pounds and specimens weighing 28 pounds have been reported.
The ideal age for the female Flemish Giant rabbit to start breeding is when they are about 9 months to one year. The first litter should be born before the female is one year old, or it may hinder her ability to give birth naturally. It is preferable that they have no more litters after the age of three years. The gestation period is between 28–34 days. On average they give birth at 30–32 days. The Flemish Giant rabbit can produce large litters, usually between 5 to 12 in a litter.