I get asked this question a lot, and the answer is simple:
Tard is female and her brother Pokey is male.
What breed is Grumpy Cat?
The best Grumpy Cat gifs
Grumpy Cat Valentine
Grumpy Cat Tard aka Tardar Sauce is a girl:
Grumpy Cat's brother Pokey is a boy:
Many fun animated Grumpy Cat cartoon gifs: