Discovery of a Waiamanlo puppy mill in 2011 have lawmakers looking at tightening regulations for large-scale dog breeders.

The goal is to prevent puppy mills from operating in Hawaii by closing gaps that allow breeders to sell dogs without a license. Revenue from dog sales equals up to $9.4 million a year, according to the Hawaiian Humane Society. 

On Wednesday, a Senate committee will hear Senate Bill 2494, which sets regulations for breeders caring for more than 10 dogs.

That would ensure large-scale breeding facilities are sanitary and large enough to accommodate all dogs on the property. It also calls for the canines to be given appropriate medical care. 

The bill also prohibits owning more than 30 dogs older than a year-old and still capable of breeding.