KGO reported that a necropsy found that Henry died of strangulation and had a punctured lung and two broken ribs.
"The last image I have of him was him in the groomer's arm and, unfortunately, bleeding profusely from his mouth," Stefan Zire, one of Henry's owners, told KGO.
"But who would anticipate that you go in for a pedicure and you die?" Terrie Peacock, Henry's other owner, told KGO.
KGO reported that Zire and Peacock are suing PetSmart for negligence.
KTVU reported that the owners' lawyer, Alison Cordova, cites 40 incidents at the retailer that involve serious injuries or deaths during pet grooming.
"The volume of reports of dogs and cats sustaining serious and sometimes lethal injuries while being groomed at PetSmart undermines the claim that PetSmart is 'where pets are family,'" Cordova said in a statement. "PetSmart claims that it trains its groomers and annually certifies its groomers in safety. If that is the case, then it seems the system is broken."
Henry's owners are seeking unspecified damages, but Cordova said they also want to set a precedent for other pets in the future.
"The goal is to change the systems, either internally or to have some sort of larger oversight and regulation of the industry. It really isn't about the money," Cordova said.
PetSmart declined to comment because of the pending lawsuit.