Dog gets chased by deer as confused owner screams

My wife went out to the garden in the morning with our dog, Copper. Copper decided to go into the woods like he usually does, where he encountered a deer. Usually he's the one chasing the deer, but this one got the jump on him. You can hear him yelp as he gets chased across the yard, eventually getting behind the deer and chasing it away. My wife didn't have her glasses on, so she didn't know what was chasing him. She runs after them chasing and yelling something in Thai, I'm not sure what. She was livestreaming with her sister in Thailand while it happened. It's pretty hilarious.