Ox tails are the actual tail, cleaned and dried. These are 10-12 inches long and vary in thickness as they are cut from the whole tail. Ox Tail choices are cleaner and less messy. All Ox Tails may contain small bones, so they are best for small dogs. By helping to scrape away tartar and plaque from your dog’s teeth, they support healthy gums and fresh, smoochable breath with every chew. Since they’re low in fat and contain no hormones, preservatives, steroids, antibiotics or chemicals, you can feel good about giving them every day as part of a balanced diet.