Backyard buddy (?)

The dogs were going crazy in the backyard and looked like they had something cornered. Hoping it wasn't another 'possum, I went out to calm them down. Check out this guy...! A nice little copperhead, about 3 feet long I'd guess. He was shaking his tail at the dogs and staring them down, but thankfully didn't strike (at least I don't think so). Got my camera to document so I could compare pics to the web and ID him! Pretty sure it's a copperhead, but happy to hear from any herpetologists in the crowd.