Breast Collar Adjustment Ensure your breast collar fits properly with advice from Brad Barkemeyer. By H&R Editors | September 28, 2020 | 1 minute read Watch now! Having a properly fitted breast collar is very important when you’re working cattle. A breast collar that’s too tight or too loose doesn’t allow your horse to perform his job properly. To watch click here. What did you think of this article? Submit Rating Thank you for your feedback!