PROTECTING OTHER ANIMALS WITHIN THE HOME
Keep the aggressive dog away from the other animals. As long as this doesn't antagonise them, allow them to see each other, but provide each with an area that they can escape to out of sight of the other.
If dogs have never fought away from home they may be exercised together, but it must be noted that it cannot be guaranteed that they will not fight on a walk.
There must be two people to keep the dogs separate at the beginning and end of the walks, when a fight may be most likely to be triggered.
Do not allow the dogs together in small spaces, e.g. doorways or sharing a car seat.