Two is too many for some households, ten is too few for others. My own personal best number feels happiest at four. I used to think I was the oddball when having four dogs raised so many eyebrows. I once had nine here, five of them being puppies. That was a hectic time! I have had eight adult dogs at once, with four being either boarders or temporary fosters on their way somewhere else. Again, hectic! Not being a fan of hectic, I have since learned to pace myself. Someday, when I have more room, both inside and outside and possibly another human to assist, I want more dogs as the status quo, but until that day comes, I will stick with a maximum of four permanent canine residents. Space is important as far as how many dogs you actually have room for in your home. Indoor space is important, but breed types can determine how important your indoor and outdoor space is. You have to decide what your own limit is. Everyone should get along, no one should have to live with permanent barriers between dogs who get along so badly that there are safety concerns.