Many times when I've been a baby about a medical procedure (such as an injection), a (usually female) medical practitioner will, when I apologize for being a baby about it, will say something like "it's always the big guys who are the babies."
Were you insulted? Or was it a good natured joke? I may try to tease a male client about his gender, but I make an effort not to offend folks.
I'm a fairly pain tolerant female... except for my teeth. I get nitrous to have my teeth cleaned, and warn all staff that I may spontaneously cry--for no good reason. I'm dentaphobic, and have sensitive teeth. I'm a big baby about my teeth.
So Emet, is it your male patients who whimper and whine when you give them an injection, never the female ones?
Nah. As a rule, little dogs whine more than big dogs, regardless of gender.
And, by the way, what, in canines, is the male equivalent of "bitch?" There is "sire", for a male dog who is a Daddy, but that's the equivalent of, what, "dame"? Is there a word which means "male dog", regardless of whether or not he has sired any pups?
AFAIK, the terminology comes from breeding circles, or are common names-- nothing scientific. Females are bitches or dams. Males are sires or studs... or dogs.