Surveillance video shows a person throwing a dog off the Stonebridge in Onset Saturday.
In the video posted by the Wareham Department of Natural Resources, the owner was seen jumping right in after it.
The dog is OK, according to Wareham officials.
The area is a popular spot for bridge jumping. The bridge stands over 12 feet tall over the saltwater below.
Officials say they know who the owner is and are investigating.
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