Because they are not supposed to feed babies.
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.
Male cats do not have functional teats like female cats do. They may have small, underdeveloped nipples but they do not serve a purpose in the same way as a female cat's teats.
Usually, yes. But the teats on a bore are for no purpose.
same reason you have them
a male is stronger
Yes, just like human males have teats and cows and heifers have teats. The only difference between the teats of bulls and cows is that the teats of a bull are non-functional.
The male rats (or mice) used in labs do not usually get neutered.
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.
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.
Males. Female rats tend to be more active. Male rats tend to get lazy as they mature.
Only male rats have testicles.