The police were notified by several individuals, both locally and out-of-state. This revealed that the authorities had been notified several times before. It was also revealed that the animal shelter had become suspicious long ago after doing some digging of their own. It's a safe bet that she was banned from the shelter shortly thereafter.
To date, there has been no action on the part of law enforcement or animal control. Why? It's complicated. Bestiality is only a misdemeanor in California. It doesn't appear to be classified as animal cruelty, either. This could mean that even if she was arrested, fined a thousand dollars and/or sent to prison, nothing would be done to rescue her dogs.
The thing about bestiality is that nobody actually takes it seriously. Kind of like prison rape. Everyone thinks it's just a big joke. And like prison rape, lawmakers have done fuckall to keep it under any sort of control. There's a couple of reasons for this. First and foremost, the police have an impossible enough job keeping up with real crimes against actual people as it is. Second is that the very nature of the crime is too icky for people to even want to acknowledge. For example, it is believed that the Florida state legislature
voted down a proposal to criminalize bestiality simply because it was considered too "out there" for discussion.
The only time in recent memory that serious action was taken on this front was the infamous "Mr. Hands" incident; that means that it literally took someone being fucked to death by a horse for anyone to give a shit. And that only fixed Washington's laws; the rest of the country hasn't really followed suit.