Six rules. The third prevents most conflicts, and it comes down to a single figure: n+1.
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Most tension between two animals sharing a home comes not from a clash of personalities but from a layout that forces them to compete for resources. Six rules.
An immediate introduction puts two animals in a position where they have to define themselves in relation to each other with no way to withdraw. Separating them at the start — a few days, with scents exchanged between them — lets them get to know each other before they meet.
How long varies: a few days between two sociable dogs, up to two weeks between two cats. Rushing it costs months.
Two bowls side by side create permanent competition, even between animals that get on well. Supervising the meal does not remove the tension, it moves it elsewhere.
In two different rooms, or several metres apart and out of sight, the question no longer arises. It is the simplest and most effective change on this list.
For n animals, provide n+1 of every resource worth competing over: litter trays, water points, beds, high perches. Two cats need three litter trays, and that figure catches people out every time.
The reason is mechanical: with as many resources as there are animals, one animal occupying a resource is enough to leave another waiting. The extra resource removes the wait, and with it the conflict.
For a cat, height is a resource in the same way food is. Two cats competing for the top of the wardrobe are not competing over an object: they are competing over the only vantage point available.
Three high perches in three rooms are worth more than one impressive cat tree in the living room.
In a household with a dog and a cat, what reassures the cat is not a closed room but the certainty that it can leave. Access to a high spot, a barrier only it can get through, a narrow gap.
A cat that knows it can leave stays. A cat that does not know it hides, and the two never settle into sharing the home.
Feeding two animals side by side, or stroking them together to “build a bond”, often does the opposite: it links the presence of the other to something imposed.
Mutual indifference is an excellent outcome for two animals sharing a home, and far more common than friendship. Aiming for quiet indifference rather than companionship avoids a great deal of counterproductive intervention.