Abraham Taylor, 36, is charged with four misdemeanor counts of animal cruelty. He has pleaded not guilty.
Taylor was charged in March after the San Francisco Department of Animal Care and Control received an anonymous complaint about emaciated dogs at "Unleashed SF Doggy Daycare," where he formerly worked.
Animal control officer Ellie Sadler testified Wednesday that Taylor's four Labrador-Weimaraner mixes were emaciated when she visited the business March 15, the San Francisco Chronicle reported.
"I could see all their ribs, spine and hip bones, and their head bones," Sadler said.
Sadler said Taylor told her he thought the dogs were fine, and that he fed them four cups of dog food a day.
Veterinarian Ruth Dilts testified Thursday that the dogs, three females and one male, were all about a year old and showed signs of malnourishment.
The dogs were taken in by Grateful Dogs Rescue, a San Francisco-based dog rescue group.