Authorities arrived minutes later and found the victim with grave injuries. The dogs were three Belgian Malinois and one Cane Corso.
Salvador was promptly taken to Riverside Community Hospital, where he passed away at 8:15 a.m.
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The victim was working at a house that was converted into a business when he was attacked by the owner's four dogs. (Google Maps)
Salvador had previously worked at the home without incident. The owner returned home within hours and surrendered the dogs to animal control officers.
Riverside County Animal Services spokesman John Welsh told Fox News Digital that the dogs were impounded and then humanely euthanized the same afternoon.
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Cane corso dog, Canis familiaris, standing on grass outdoors. The ancestors of this breed were the mastino dogs of Tibet, dating back 1000 years. (Auscape/Universal Images Group via Getty Images)
Welsh said that the dogs were all tested for rabies, which is typical in severe bite cases. The dogs were not in his department's database as aggressive animals, nor did they have a rabies vaccination history.
"This is a grave example of why it is important to be a responsible dog owner," Welsh told Fox News Digital. "With strong dogs, you want to be extra vigilant."
A picture of a Belgian Malinois laying down in a field. (Patrick Pleul/picture alliance via Getty Images)
"A man was just trying to do some work and make a few bucks for him and his family. He starts his day where he was supposed to go, and he ends up dead," he added.