A multi-species household isn't a problem to solve — it's a balance to maintain. Each animal needs space, dignity, and an escape route.
Separate resources
Separate food bowls in separate rooms, ideally with the cat's elevated. Separate water sources too. Resource guarding flares up when shared resources are unclear.
Cat-only zones
At least one room or vertical area where the dog cannot follow. Cats need this even when they get along with the dog.
Most cat-dog tension comes from the dog being too interested. Teach a solid "leave it" and reward the dog for ignoring the cat. The cat will reciprocate over time.