I'm not sure groups as a whole could be considered compatible, but I do think generally speaking, some breeds can work better with certain ones. I know with having Terriers, I'm very cognizant of not getting other dominant breeds to go with them. I found that mine did much better with breeds, like Collies or Shelties, but I wouldn't go so far as to say herding breeds as a whole, because they didn't much care for GSDs.

I think trying to put together similar energy levels with opposing temperaments can work well. When I had 2 terriers, 1 male and 1 female, I had a bit of an issue. One was a couch potato, the other a whirlwind of energy. Also, there was not enough difference in temperament. Although Maddie was clearly the dominant one, Murph was not so submissive that he would cowtow to her every demand. But now, even with 3 males (1 terrier, 2 Collies), I have harmony, because although the 1 Collie is somewhat dominant for a Collie, he'll back down in an instant if the Terrier, who's somewhat submissive for a Terrier, challenges him.

Par...