Oh dear, I'm so sorry you had this spot of bother. First thing to remember - treats and food cause problems if not properly dispensed / monitored !

I would take them out somewhere away from home and try to get them interested in other surroundings, on a walk, a free run in woods (if you can trust your boy). Once they accept being together away, then reintroduce them to the house. Best to let the boy in first and then the girl, i.e. the one who is 'at home' before the visitor. OK not a visitor but he's been there for longer. It might take two of you, each with a dog on a lead and then gradually get them together and sniffing the same blade of grass. You may have to do this a number of times and when you are sure of them (as sure as one can be with Basenjis) then get them indoors again and, standing ready with a noisy toy or something to distract their attention at need, leave them loose.

If he is severely injured, don't separate them to different rooms. Make sure they can see and smell each other all the time. We had up to eight living in the house and often there were be some kind of contratemps but it was always of short duration. I am always the alpha, I am bigger than they are and it is MY house. Any injured dog was crated in the kitchen in full view of the rest of the pack as they came and went.

Meal times were absolutely fine. I have a big kitchen and as long as the food pans were put down from the same hand to the same dog in the same order and on the same spot on the floor at each and every meal - they knew when it was their turn and never fought over food.

Spaying the girl is not going to stop fights ! And as the boy is neutered there is no immediate hurry.

Good luck !

Zande