According to American Kennel Club, it depends on the breed but male and female dogs can have average from 8 to 10 nipples. They are usually even numbers of nipples that are aligned symmetrically in two rows along their belly and chest.
It's easier to see the nipples on shorter coat dogs and a bit harder to see the nipples of a longer coat dog but a quick belly rub will tell you all you need to know.
Generally, the larger the litter a dog can birth the more nipples they have. The number of nipples on a mammal is proportional to the number of young it can produce at one time. For instance humans have two nipples. Apes, horses, and humans have two nipples usually meaning they can produce on average one to two babies at a time. So for mammals, the more nipples you have the larger the litter you can have.
Both males and females dogs have nipples. Just like human males, the male dogs' nipples serves no purpose.The female dog's nipples are for breastfeeding their pups. Puppies are nursed until they are at least 6 weeks old for larger pups or 8 weeks old for smaller breeds.
How many puppies can a golden retriever have?
According the Reference, the average litter size is 8 and a litter size can on vary anywhere from 4 to 12 puppies. When they are pregnant or in heat, a female dog will have enlarged nipples. A golden retriever's gestational period is 63 days from conception to birth. Your vet can tell if you dog is pregnant through hormone tests, X-ray, palpitation, or ultrasound.
How can you tell if your dog is Pregnant?
One of the first signs you will notice is a loss of appetite. However, as gestational period continues, her appetite will return and increase. Your dog might also show less interest in exercise and sleep more than normal. According to How to Animals, goldens can become very affectionate during this time.
After a few weeks into their pregnancy you might notice weight gain and the size of her belly will look like her stomach is bloated. This is not the case with all dogs. In some rarer instances, you may not be able to tell until your dog is close to birth.
As your dog gets closer to giving birth, it's nipples will enlarge and you may even see some milk leaking from their nipples.