Hey Steve/ MArcelo
Marcelo, thats a pretty tough situation. I'm assuming that you've looked at some of the more friendly types of dogs -I only know of a few breeds of dogs such as the Coton's and Lasha's that are good. I've a close friend that can only have one of those types of dogs - anything else is dangerous to her and cats are a no no altogether.
Grace, was a wonderful dog..really nice and calm.. a bit like my Bully.