lol, you can be creative with it if you'd like!
If you want it to be even more secretive, I suggest you putting only your address as a return address (no names) and leave a piece of paper inside the box somewhere with your name, YT name and your doggy's name so the person eventually will know who to thank!
Personally, what I have done was leave the return address nameless and I bought a card and stuck it in there so they'll look at the gifts and still won't know who it's from until they open the card!
It's all up to you on this. You could just leave your name out altogether until they get on here and ask who it's from (but I wouldn't suggest that!).
I'll leave that up to you guys!