Dogs are typically in heat for about two to four weeks. Most females will go into heat twice a year, approximately every six months. Certain breeds, like the basenji and the Rhodesian ridgeback, only go into heat once a year.

At what age do Rhodesian Ridgebacks go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How long does a ridgeback season last?

Heat usually lasts between 2-4 weeks. Early in the cycle, a female dog may not be receptive to male dogs, although some are receptive through the entire cycle. It can be shorter or longer and you'll know the cycle is over when all her vulva returns to its normal size and there's no more bleeding or discharge.