Women’s History Month is a celebration of women’s contributions to history, science, culture and society and has been observed annually in the month of March in the United States since 1987.

In celebration, we honor the great Dr. Margaret Phyllis Lose (11/15/25 – 9/30/19) well known for being the first female equine veterinarian in the United States, pioneering lifesaving surgery techniques for racehorses, handling 180 police horses for the city of Philadelphia and – if that’s not enough – author of many best-selling books.

Dr. Lose began her career as a teenager, starting as a young entrepreneur boarding horses. At 15 she began exercising racehorses. At 19 she became the youngest racehorse trainer in the country and the third woman in the United States to hold a trainer’s license. Dr. Lose was also a prized show jumper. In 1952, she rode her own beloved mare, Cassadol, to victory in the Devon Horse Show Open Jumper Class.

Learn more about Dr. Lose’s beloved mare, Cassadol

Her contributions to women’s history in science continue with her graduation from the University of Pennsylvania veterinary school in 1957 as one of two women in a class of 50. She gradually built a network of well-respected clients including film star Grace Kelly, who helped Dr. Lose open her private practice.

“Hollywood” proved to be Dr. Lose’s future calling. In 1999 her dog, Oscar, won a Purina dog food contest. After close to 50 years in practice she closed her doors and moved to Florida to pursue Oscar’s movie career. In Florida, Dr. Lose took her boards again and worked as a track vet while waiting for filming of Oscar’s movie.

Dr. Lose’s groundbreaking resume also includes serving as primary care vet to the Philadelphia Mounted Police and K-9 Unit (1961 – 1980), the largest equine unit in the country, and the track veterinarian at Philadelphia Park.

Dr. Lose lived in Florida in her later years and passed away in 2019. Her story is one of pride, encouragement and success for equine veterinarians and women of all ages.

Dr. Phylis Lose books can be found on www.amazon.com