Add me to the chorus wherein 2 B's are actually an improvement over having only 1. When I see other people with only 1 dog, I feel sorry for the dog. They are naturally social pack-oriented animals. I also agree on the common advice of pairing opposite sexes, or if it works out, two males. 2 females rarely work out…I know, because I fostered a few females, and my resident female always made it clear that only one queen could rule the roost.
When we got Buddy, our first B, he was always chasing the resident cats and chewing on things. When we brought home Bella, his pesky behaviors immediately ceased and they bonded within a few weeks.
2 B's are easier than 1!
Also agree on the need to let the B's work disagreements out on their own. 95% of the time, it seems, major disagreements are triggered by human behaviors. Example: last week, my daughter scolded Buddy for reaching for something on an end table. That got him thinking "If I can't have it, then sure as heck, Tippy can't either, and I better make sure he understand that!!!" Then, Buddy went after Tippy in a "kick the dog" frustration reaction.