I second what Tanza said, it saddens me immensly to see those two dogs being basically given away, especially since Duke is no rescue, he is the father of my dog…they might have "rescued" him at one point, but they did use him for a litter, so rescue..I don't buy that..sorry to say. The female has had a litter as well..for them that is, more then likely she has had a lot of litters over her years..I'd take her just to get her inside in my home, where a dog like that belongs, inside with her humans, especially since she has been so "used" over the years, poor thing, but my house is full.
JBLS, I am glad that you know what to look for in a B, I just wanted to give you a heads up. My Otis has not been very destructive yet (?!?), but I have heard horror stories so I know it can happen. I am sure you will find what you want/looking for with either Brat or Petfinder. You could also check out some of your local shelters for B-mixes, but then again, you don't know what you are getting, as far as traumatized dog. Most shelters have connections with petfinders anyway. Some responsible breeders have juvenile dogs they are looking to rehome, so if you have a breeder that you have looked into, they might know of a B that needs to be rehomed..A responsible breeder will have had all health testing done, and it will be proudly displayed on their website, if not more then likely it is a shady breeder..
I hope you find him/her soon.