hi

Ok, so I'm trying to figure out this person's birthday, but she won't tell me directly. So instead, she gave me a riddle to figure it out, and I'm not sure how to get the answer here.
The riddle is "dead dog"
Apparently, if I figure it out, I'll find out the month/day of her birthday (both are single digits)
She said to think in Chinese to figure it out...

Any advice or help?
I have faith, tl can solve everything