Video shows dog riding on cage behind SUV on I-95

The video has been viewed more than 500,000 times. Source Supplied

The video has been viewed more than 500,000 times. Source Supplied

Authorities in Florida have launched an investigation after a video emerged on Facebook of a dog chained to the top of a crate being towed by an SUV driving at least 70 miles per hour.

"I was just completely outraged and appalled", she told ABC News Thursday.

Brenna said the dog appeared to have the letter "S" permanently marked onto its leg.

The dog's owner, who wished not to be identified, told WTLV in Jacksonville the crate was an "OK" way to transport the animal and is "how everybody transports".

St. Johns County, and authorities are looking into the well-being of the dog.

The man who said he was the dog's owner told the station the pit bull wasn't a fighting dog, but a hunting dog he uses to hunt hogs.

Though he feels like he didn't do anything wrong, the owner said, he understands why people are in an uproar when they see the video.

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The driver has been cooperative with the animal investigators, who are part of the Flagler Humane Society, and assisted by the Flagler County Sheriff's Office.

There are about a dozen dogs on the property, and officers from Saint Johns County Animal Control also visited to investigate, Carotenuto said.

The law she is referring to is an ordinance in Flagler County about transporting animals.

After the Humane Society's investigation is completed, it will turn over its findings to local police to determine if the owner will face charges.

Zeus was only tethered to the trailer once, Ritter said.

Amy Carotenuto - who directs the Flagler Humane Society, which oversees Animal Services - said that as far as Animal Services can tell, "We do not think (the driver) meant to harm the animal". "Make sure your animal is contained while you travel".

The dog in the video was restrained by just one tether, which violates code, but there's nothing that says animals can't ride outside on the trailer other than common sense.