I have a yorkie with MVD as well. They can live normal lives, but it's important that they adhere to a strict protocol especially if she does have seizures when she doesn't take her medicine. That means she gets HE symptoms.
My biggest and most important piece of advice to you is to join
http://pets.groups.yahoo.com/group/L...d_MVD_Support/
before you decide to adopt this baby so that you know what you will or could be dealing with.