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:
Smiling Grumpy Cat
Happy New Year Memes
Ellen, Katy Perry, and Grumpy Cat Grammy gif
Grumpy Cat 99 Little Bugs in the Code