Give the cat territory and the dog a boundary before they meet
A first dog-and-cat meeting fails most often because the cat has nowhere to go. Before any introduction, set up a dog-free room for the cat with litter, water, food, a scratching post, and a hiding place, and add high routes in shared rooms: a shelf, a cat tree, or the back of a sturdy sofa the cat can reach and the dog cannot. Fit a baby gate the cat can slip through or jump but the dog cannot follow. At the same time, be honest about your dog: a dog with a strong chase drive, a history of grabbing small animals, or no reliable response to its name needs a much slower plan and professional help, not optimism. Keep the dog on a lead or behind a gate for every early stage, no matter how friendly it seems.
Trade scent before either animal sees the other
For the first few days, the introduction is smell only. Feed both animals on opposite sides of the closed door to the cat's safe room, starting far enough away that both eat normally and moving bowls closer only as they stay relaxed. Rub a soft cloth gently on the cat's cheeks and let the dog sniff it during a calm moment, then do the same with a cloth carrying the dog's scent for the cat, placing it near, not on top of, where the cat rests. Swap bedding for a night once both animals are eating and sleeping normally with the new smells around. If the dog whines, scratches, or fixates on the door, go back a step and add distance at feeding time; scent work that stays boring is scent work that is working.
Move to sight through a barrier, and reward looking away
When scent is unremarkable, let the animals see each other through the gate or a door opened just enough for a view, with the dog on a lead and a second person near the cat. Keep these glimpses short. The behaviour you are building in the dog is specific: notice the cat, then turn back to you for a reward. Practise that look-away in short sessions, and end while the dog can still respond to its name and take food gently. If the dog lunges, barks continuously, or goes still and stares, increase distance and shorten the session rather than correcting the dog next to the cat, which can link the cat with being told off. Let the cat choose how close to come; a cat who watches from a high perch and then leaves is participating exactly as a cat should.
Let shared time grow only as fast as calm behaviour allows
Once gated meetings are relaxed, try brief time in the same room with the dog still on a lead that trails only when you are confident you can step on it, and only ever with the escape routes open for the cat. Never carry the cat toward the dog, never let the dog chase even in what looks like play, and separate them when you cannot actively watch, including overnight, until weeks of calm behaviour say otherwise. Some pairs become companions; many good outcomes are simply peaceful coexistence, with the cat ruling the high ground and the dog ignoring it. Tracking who fed on which side of the door, who supervised each session, and when the pair reached the next stage is easier when KinsLe Care Teams lets you assign those introduction tasks and mark each supervised meeting complete with a timestamp.