Netherland Dwarf rabbit: the dwarf gene and what to check before adopting

Veterinary note — This page describes a breed and its predispositions, not a diagnosis. Incisors that do not meet properly, a rabbit that sorts or ignores its hay, drools or loses weight needs a vet experienced with rabbits.

The Netherland Dwarf — called nain de couleur in the French breed standard — is one of the smallest rabbit breeds: its ideal weight is 1 to 1.35 kg, and the UK charity PDSA describes it as a rabbit of under one kilo. What really sets it apart is not its size but the gene that produces it: carried in a single copy, it gives the small frame and round head; carried in two copies, it is lethal. That gene explains why some “Netherland Dwarfs” grow bigger than promised, and why you should look at the incisors before adopting.

This page covers this breed specifically. The general confusion around the word “dwarf” is dealt with in dwarf rabbits: adult size and real needs, and the overview of sizes in the main domestic rabbit breeds.

Netherland Dwarf or nain de couleur: one and the same rabbit

Both names refer to the same breed. “Netherland Dwarf” is the international name used in pet shops and by British and American clubs; “nain de couleur” is the name adopted by the French rabbit breeders’ federation.

The visible difference from the Polish lies mainly in the coat: the Netherland Dwarf comes in many colours, while the Polish is white with red or blue eyes. Questions specific to a white coat and albino eyes are covered in Polish rabbit (Hermelin): who is it for?.

The dwarf gene: why a Netherland Dwarf can outgrow its label

The Netherland Dwarf’s small size comes from a mutation identified in 2017: a deletion of about 12,000 base pairs affecting the HMGA2 gene. The reference study established three points with very practical consequences:

1. A single copy of the gene is enough to produce dwarfism: the rabbit stays around one kilo and has a proportionally larger head with an altered skull.
2. Two copies are lethal: affected kits die within a few days of birth.
3. The same gene is found in other dwarf breeds, including the Holland Lop, a small lop, and long-haired dwarfs.

Applying the laws of inheritance, a pairing of two dwarfs gives, in theory, a quarter of non-viable kits, half dwarfs and a quarter of kits that do not carry the gene. Breeders call the latter “false dwarfs”: they have ordinary rabbit proportions and can end up well above the breed standard’s weight. They are healthy and do not carry the skull changes linked to the gene, but they are frequently sold as “Netherland Dwarfs”.

The practical rule is the same as for every small breed: ask for the weight of both parents and size the set-up for the higher estimate. The approach is set out in dwarf rabbits: adult size and real needs.

Before adopting: look at the incisors

This is the most useful check, and the one least often done. The Merck Veterinary Manual describes malocclusion as probably the most common inherited disease in rabbits, and states that genetic malocclusion can generally be detected in rabbits 3 to 8 weeks old — before or at the point of sale. VCA adds that dwarf breeds are over-represented in dental disease, and that an inherited malformation can only be prevented through the choice of breeding stock.

How to look, in ten seconds, with the seller’s agreement:

• Sit down with the rabbit on the floor or on your lap, and gently lift the upper lip.
• Normal: the two large upper incisors sit slightly in front of the lower ones, like closed scissors.
• Abnormal: lower incisors in front of the upper ones, incisors meeting edge to edge, teeth that splay, grow crooked or look clearly too long.

A defect of this kind cannot be corrected: it is managed for life, usually with repeated dental treatment whose nature and frequency are for the vet to decide. It is not a reason to reject the rabbit, but it is information you need before committing, for your budget as much as your workload. Warning signs in adults are covered in rabbit dental malocclusion, and the other checks to make with the seller in how to choose a rabbit breeder or buying a rabbit from a pet shop. A kit should not leave its mother before it is properly weaned either: see when is a rabbit weaned.

Day to day: what a one-kilo frame really changes

A Netherland Dwarf’s basic needs are those of every rabbit: unlimited hay, space and daily exercise. Three points do, however, become more sensitive in such a light animal:

1. Every gram counts. A 100 g loss is about 9% of the weight of a 1.1 kg rabbit, against just over 3% for a 3 kg rabbit. A weekly weigh-in on kitchen scales shows what the eye misses: see how to weigh a rabbit at home, and the warning thresholds in my rabbit is losing weight.
2. Hay is also the first dental indicator. A dwarf that sorts through its hay, chews on one side or switches to pellets is often signalling a tooth problem before any other symptom. Quantity guidance is in how much hay does a rabbit need.
3. Handling happens on the floor. The PDSA points out that a rabbit’s back is fragile and can break in a fall; a one-kilo animal that struggles recovers its footing even less well. Care, weighing and tooth checks are done sitting on the floor — see my rabbit doesn’t like being picked up.

Temperament: the timid reputation

The PDSA describes Netherland Dwarfs as often timid and easily frightened. That is a reported tendency, not a prediction for any given individual: health, past experience, socialisation, reproductive status and environment all shape behaviour. What the reputation usefully reminds you to do is provide hiding places, approach at floor level and let the rabbit come to you. The method is in how to tame a fearful rabbit, and reading the signals in how to read rabbit body language.

Where to go next

A concrete next step: when you meet a Netherland Dwarf you might adopt, ask three questions and make one check — the weight of both parents, the date of birth, the age at weaning, then a look at the incisors. Four clear answers are worth more than any breed label.

To compare with its white form, see Polish rabbit (Hermelin): who is it for?; for the other small breeds, dwarf lop rabbit and lionhead rabbit. Our other guides are gathered in the rabbit breeds section and on the rabbit species page.

Sources

• Carneiro et al., Genetics (2017) — rabbit dwarfism caused by a deletion at the HMGA2 locus
• Merck Veterinary Manual — Noninfectious diseases of rabbits (inherited malocclusion)
• VCA Hospitals — Dental disease in rabbits
• PDSA — Netherland Dwarf
• French rabbit breeders’ federation (FFC) — Nain de couleur standard