[ Other - Pets ] Open Question : Are boxer shepherds good with cats?

Hi, recently we have been looking for dogs at the ASPCA shelter after my dogs tragic heart attack 2 months ago. We saw a boxer shepherd that is a well behaved female. She does good with other dogs and strangers to. But I'm wondering if they are good with cats because they said she has never been around cats. I have 1 cat at home that can really defend herself. But I don't want the dog killing the cat by the first week she is living with us. So my question is: Are boxer shepherds good with cats?