
The van had left the Southern Pines Animal Shelter about 1:30 p.m. Friday before being forced to stop near Sardis, about four hours into the trip.
The two volunteer drivers discovered the dead dogs as they worked to unload them.
Southern Pine Rescue group director Ginny Sims told WREG a veterinarian with the group was sent to investigate the causes of death. Sims said she believes carbon monoxide poisoning from a mechanical malfunction, and not heat, may have been to blame.
"We are committed to helping save the lives of pets in need, and any life lost in our care is something we take very seriously," the organization said on its Facebook page Saturday.
Witnesses said the van was on the side of the highway for two to four hours, with dozens of kennels outside, before area animal rescue groups could provide assistance.












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