Length of a estrus cycle of a cavalier king Charles spaniel?

The estrus cycle of a Cavalier King Charles Spaniel typically lasts about 2 to 3 weeks. This cycle occurs approximately every six months, although it can vary among individual dogs. The cycle consists of four stages: proestrus, estrus, diestrus, and anestrus, with the most fertile period occurring during the estrus stage. It's important for owners to monitor their dog's behavior during this time for any signs of heat and potential breeding.