My daughter this to me and I though is was so cute.
I have no idea how they do this, click on link below: TYPE IN a command and see what happens... sit, roll over, down, stand, beg, sing, dance, shake, fetch, play dead etc. and...it's also very cute if you type in a command that's not recognized...!! Make sure you type in 'Kiss' too, but do it last.
http://www.idodogtricks.com/index_flash.html