Cat introductions should be slow enough to be boring. Fast face-to-face meetings can create fear, chasing and grudges that take much longer to repair than a patient introduction would have taken.
Scent swapping is the early stage where cats learn that another cat exists without having to defend a doorway, food bowl or favorite sleeping spot.
Start With Separate Spaces
Give the new cat a separate room with food, water, litter, bedding and hiding. Resident cats keep the rest of the home. Do not let them meet nose to nose at the carrier door. The first message should be calm scent, not surprise contact.
Swap Soft Scent Items
Use small cloths, bedding or soft toys that carry each cat’s scent. Place the item near the other cat’s area but not directly in the food bowl or bed at first. Watch reactions. Calm sniffing, ignoring or mild curiosity is useful. Hissing, swatting or avoidance means slow down.
Pair Scent With Good Things
Feed or offer treats at a comfortable distance from the scented item. The goal is not to force affection. The goal is to let each cat experience the other cat’s smell while safe, fed and unpressured.
Use the Door as a Boundary
When scent reactions are calmer, feed on opposite sides of the closed door with distance adjusted to each cat’s comfort. If either cat refuses food, growls or fixates, move bowls farther away and return to an easier step.
Do Not Rush the Visual Stage
Visual access through a cracked door, gate or barrier comes after scent is less dramatic. Keep sessions short. End before conflict builds. Do not allow chasing, cornering or free contact because one moment seems calm.
When To Get Help
If there is serious aggression, injury risk, persistent refusal to eat, or intense fear that does not soften with slower steps, ask a veterinarian or qualified behavior professional for help. Introductions can take weeks. That is not failure. That is cats being territorial animals with memories.