Why do female dogs only have niples that produce milk ?

Question

AND WHAT WILL HAPPEN IF A DOG IS PRODUCING MILK FROM THE NIPLES AND SHE IS NOT PREGNANT OR HAD ANY PUPS .

Answer 1

all female mammals produce milk, and some dogs will go through what they call a fake pregnancy and will produce milk.... doesn't mean that she is pregnant.

Answer 2

Females only priduce milk because they must feed their pups, and there is nothing wrong with a female if she is producing milk.

Answer 3

She might be going through a false pregnancy. I had a co-worker whose dog went through that and she had to end up getting her spayed. I would talk to the vet.