When do female dogs stop going into heat?

"Most female dogs come into season for the first time between 6 and 12 months, although some larger breeds delay until as late as 2 years. read more

A heat cycle -- also known as estrus cycle -- refers to the period in which a female dog is fertile and can become pregnant. Dogs usually have two heat cycles a year, although this can vary among breeds and individual dogs with some dogs having cycles only once a year or less. read more

This is a great question! Dogs never stop going into heat although as they get older it may become less frequent. Even if she didn't go into heat for a year or more she will eventually go back into heat. I feel badly she can't be spayed. read more