In the video, a person is seen putting a Christmas tree costume on a dog. The costume is green with white trim and decorated with colorful pom poms. The person adjusts the costume on the dog's back, making sure it fits properly. The dog seems to be cooperative and calm during the process. The person then pets the dog, showing affection and making sure the dog is comfortable in the costume. The video captures a heartwarming moment of a pet owner dressing up their furry friend for the holiday season.