The Clayton County Animal Shelter will be closed until at least Wednesday, out of concern that a seriously ill dog may have canine influenza.
Acting Clayton County Police Chief, Michael Register, said shelter workers first realized how sick the dog was Sunday morning.
"We immediately sought treatment for the canine," Register said.
Chief Register said a local veterinarian suggested testing the dog flu, and that the animals still in the shelter be quarantined and treated with antibiotics.
"We're truly trying to work with the medical personnel in our area and doing all we can to treat these animals and if at all possible, restored to health," Register said.
He said only the one dog has shown signs of being extremely ill.
Some rescue groups that have long criticized Clayton County for how it maintains its shelter said they worry sick dogs will be euthanized.
If the sick animal has dog flu, Register said additional precautions will have to be made at the shelter.