Female dogs stop going into heat, also known as estrus, around 6 to 8 years old. However, this age range can vary depending on the dog's breed, size, and overall health.
Here are some factors that can influence when a female dog stops going into heat:
- Breed: Some breeds, like smaller dogs, may enter their last heat cycle earlier than larger breeds.
- Size: Larger dogs tend to go into heat for longer periods than smaller dogs.
- Health: Certain health conditions can affect a dog's reproductive cycle and may cause them to stop going into heat earlier or later.
- Spaying: If a female dog is spayed, she will no longer go into heat.
It's important to note that while a female dog may stop going into heat around this age, she can still become pregnant. If you are concerned about your dog's reproductive cycle, it's best to consult with your veterinarian.