HRS §143-14
Keep female dogs confined during heat
This section makes it illegal for a dog owner to let a female dog run loose while she is in heat. It applies whether the dog is licensed or not. The rule is narrow and only covers this specific time.
The statute, as written — Female dogs
It shall be unlawful for the owner of any female dog, licensed or unlicensed, to permit it to run at large while the dog is in the copulating season.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.