December, March, May and September are good times to deworm. Rotating dewormers may help reduce parasite resistance to dewormers. There are 4 chemical classes of dewormers available for use in horses. To truly rotate, use different classes of dewormers, not just different brand names. Below are listed the chemical classes of dewormers and the brand names I could find.
Horses require regular foot care.
Find a farrier and allow that person to used their knowledge and skills. A Coggins test is a blood test to detect the disease, Equine Infectious Anemia. There is no vaccine or treatment for this disease. Some horses, such as those at boarding stables or horse shows, and required to have an annual negative Coggins test. Horses should have their teeth checked annually for abnormal wear.