He bumped into two women who had heard a dog barking while walking along Tomahawk Beach.
They called the Otago SPCA and Land and Marine SAR, and volunteers arrived about 1pm.
Two men went over the cliff on ropes in an effort to see Snoopy, while others took to an inflatable life raft and scoured the base of the cliff from the ocean.
The dog was discovered about 12m below the cliff top, on a narrow ledge, and was difficult to reach.
Mr Hovius waited anxiously at the top and was overcome with relief when a shivering Snoopy was placed in his arms.
"He's a survivor," Mr Hovius said.
Mr Hovius had taken Snoopy's collar off because the dog was recovering from an abscess on its neck, so had not been on a leash.
Snoopy was examined by a veterinarian and given the all-clear before Mr Hovius took him home.