San Diego County Sheriff's Dept.
An image provided by deputies shows pot plants inside a room with boarded up windows.
Deputies investigating a call about animal abuse found more than 100 pot plants growing inside a Valley Center home Tuesday.
San Diego County Sheriff's Deputies arrived to the home located on the 11900 block of Keys Creek Road around 3:20 p.m. following up on a report of a man beating a dog.
The same home had been the site of a home invasion robbery and deputies recalled weapons inside the home so they called for backup.
While looking around the home, deputies said they spotted the marijuana operation inside the house.
Once they went inside, they discovered more than 100 marijuana plants, an indoor irrigation system and grow lighting deputies said.
Investigators estimated the street value of the marijuana to be about $300,000.
Four people were taken into custody.
Keep up to date on breaking news: Follow us on Twitter @nbcsandiego, fan us on Facebook, sign up for our breaking news e-mail alerts or text SDBREAKING to 622339 to receive text messages for local breaking news. (For more info, text HELP. To end, text STOP. Message and data rates may apply.)