You can't tell except by watching them mate. If the female is in heat and there are many males around it is most likely one if not more have mated with her.
the female is usually the one with ruffled wing from being mated with
Just like your question, both of the male shih tzus are the fathers.
You can tell by how it acts
u just kinda look underneath if its there, its male if its not its female :)
Feeder fish, How do you tell male from female of the?
How do you tell a male pacific frog from a female
They may be male and female. The male be trying to tell the female that he is ready to spawn!!
Sometimes. Because a female feet is shave and really soft. A male feet is hairy and muscular.
You can tell if a dog is male or female by looking at their genitals. Male dogs have a penis and testicles, while female dogs have a vulva.
Both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
You can tell a male angel fish from a female one by all the colorful stripes it has. [the male one]
Mostly the male stinkpot turtle would probably be much smaller then the female stinkpot just like in frogs the male is smaller than the female turle