There is no menopause in dogs, so older female dogs continue to have heat cycles, but they will become further apart and her fertility will decrease. The first phase of a heat cycle lasts an average of nine days.

At what age do female dogs stop going into heat?

When do seasons start and finish? Seasons usually start at around six months of age but can be as late as one year to eighteen months. It is often thought that small bitches usually start their seasons sooner than larger bitches of dog as they take longer to mature.

How do you stop a dogs period?

Spaying to Prevent Heat Cycles

According to leading veterinarians, your dog does not need to experience her first heat cycle before you can have her spayed. Spaying involves surgically removing your dog's uterus and reproductive organs. It is a permanent solution that cannot be reversed.