Rotties require lots of brushing because they do lots of shedding and I would imagine the same is true for a GSMD and Bloodhounds. Don't Bloodhounds usually need jobs? Pitties are medium sized, but she would have to go with an adult that isn't animal aggressive.

My suggestion would be going to the shelter and interacting with the adult dogs and take your dogs along to make sure everyone gets along. Or find a breed specific rescue.

How about:

American Bulldog
Dogue de Bourdeaux
Greyhound
Dogo Argentino
Boxer