Because they are not supposed to feed babies.
Male human beings and males of most mammal species have teats, too. They are just undeveloped in males, fully developed in females.
She has them, so do male dogs (there are very few male mammals without teats, rats are one of the only species where this occurs). They do become more apparent with pregnancy
Female Rats and Mice have 12 teats.
Usually, yes. But the teats on a bore are for no purpose.
same reason you have them
There are six on both male and female.
a male is stronger
no For cattle, cow is the designation for female, which has an udder and teats. The male, the bull, like most mammals, has rudimentary nipples but no teats and no udder.
The male rats (or mice) used in labs do not usually get neutered.
Female rats don't just turn into male rats. Sometimes a male rat's testes will be withheld in his body as a result of stress and he will appear to be female. Of course in such a situation, he is still male.
Due to the possibility of some male dogs having higher levels of estrogen than others, yes it's possible for a male dog to have teats. It is however mostly unlikely.
Males. Female rats tend to be more active. Male rats tend to get lazy as they mature.
Only male rats have testicles.