Thirteen - forget the alpha roll!
There are 2 things you want to do to deal with this. The first is, like honeybunny said, teach a "drop it" command. Let us know if you need more help with how to teach it.
Second, Emma is object guarding. Here is an excellent article on deal to deal with it:
http://www.clickersolutions.com/arti...ctguarding.htm
Let us know if you need more help!
