Labrador Retrievers in heat

Question
At what age do female dogs stop going into heat and bleeding?  I have a 10 year old female that seems to be having unusually heavy bleeding during her heat.  She has a strong odor to her that I have not noticed in the past.

Answer
Dogs are not like humans.  They do not go through menopause.  They continue with their heat cycles through their entire life.  If her current cycle seems abnormal compared to what you have been used to in the past, you best see a vet.  There is a condition that is called Pyometria, which is an infection in the uterus which can cause a bad smell.  

For example, breeders that keep intact bitches, they normally spay their girls by age 6, as there is a great risk of uterine diseases in older bitches.