Irregular heat cycles happen. Female dogs and cats can experience split heats, prolonged heats, silent heats, and absent heats. Heat cycle abnormalities can be perplexing and frustrating. Thats where Breed Heat from Thomas Pet comes in. Breed Heat is an herbal-based supplement designed to help regulate hormones and bring female animals into normal heat cycles. The liver-flavored formula contains a variety of ingredients that help support the reproductive health of female dogs and cats as they prepare for breeding.