Cisneros also reviewed surveillance video of the incident, which showed a woman exiting a white Jeep and tossing a bag into the dumpster, authorities said.
While searching the woman's house, authorities discovered approximately 30 other dogs inside, living under less than ideal circumstances.
Deborah Culwell, 54, was arrested Monday after seven discarded pups were left in scorching 90-degree weather next to a dumpster behind Napa Auto Parts store, according to the Riverside County Department of Animal Services.
Riverside County Animal Services Commander Chris Mayer made the arrest, and the pups have since been relocated to Coachella Valley Animal Campus - although it is not known what they will study.
If found guilty on all counts, Culwell could face up to six years in jail.
"If not for the Good Samaritan's actions, the puppies may not have survived much longer", said the Riverside County Animal Services in a release.
Not immediately understood is what compelled Deborah Culwell to dump the puppies to what would have been their horrid death had the pups not been found.
"There is no excuse for dumping puppies", Mayer said. "This was a shameful act".
"We were uncertain who would care for the dogs after she was arrested, so we were forced to impound all 38", Riverside County Animal Services said in a press release.
"We do feel strongly that this rises to a felony of animal cruelty and when we submit our case to the District Attorney's office, we do believe we'll be successful in pursuing seven counts of animal cruelty". The temperature was in the low 90s that day, and the puppies were near death when animal control officers arrived.
If a man, whom police identified only as "John", hadn't passed by soon after and heard the dogs' cries, Welsh said, they could've died. "I think the puppies were yelping or crying and that's what attracted him to the trash can".