Take introductions slow over days/weeks. Rushing can overwhelm and stress pets.
Swap bedding so new pets can get used to each other's smells first.
Give new cat their own room with food, bed, litter box at first for a safe space.
Only allow interactions under your close supervision so you can redirect bad behavior.
Gates allow pets to see each other before direct contact.
Use Baby Gate
Give treats when dog and cat are calm and relaxed around each other.
Reward Calm Behavior
Verbally interrupt hissing, raised fur, barking, chasing or other bad signs.