Rabbits are not subject to breed-specific legislation, so no law anywhere targets the Netherland Dwarf by breed; legal questions concern rabbit-keeping in general. The breed is treated under the law exactly as any other domestic rabbit.
The most consequential restrictions are jurisdictional. Some places regulate or prohibit keeping domestic rabbits as pets, with the Australian state of Queensland's broad ban on private rabbit ownership being a prominent example driven by ecological concerns. Such rules apply regardless of breed or size.
In the United States and most of Europe, keeping a Netherland Dwarf is legal, but local ordinances may classify rabbits in particular ways, cap the number kept, or set conditions in residential areas. Checking municipal and county rules before acquiring a rabbit is the responsible first step.
Because this is general information and not legal advice, and because rabbit-keeping law varies by place and changes over time, prospective owners should confirm the current rules with their local animal-control or agricultural authority.