I've split my dog in half and things are going great!

Now, part 3 of the tutorial ends with the instructor saying "Do the same with your nose and ear."

So I'm trying to boolean->union my 1/2 dog body and nose. But, it's not working - instead they both vanish. Is this a result of having my dog's body chopped in half? You see, in the video all of the boolean->union processes were with a full-bodied dog and whole parts. Should I be using half a nose or a whole nose? Should I some how mirror my dog's other half before combining? I can't seem to get it to work otherwise.


Thanks tons!