Feliway Classic delivers a synthetic copy of the pheromone cats deposit when they cheek-rub familiar territory. The idea is subtle environmental signaling, not sedation. Many owners report softer baseline tension: less pacing, fewer urine marks in specific conflict scenarios, or easier carrier association when paired with training.

Results are inconsistent. Cats in pain, with severe fear aggression, or with untreated urinary disease will not magically normalize because a wall outlet smells friendlier. Diffusers also cannot fix overcrowding, dirty litter, or outdoor cats staring through glass. Use them as one layer in a broader plan that includes enrichment, litter management, and vet-directed treatment when needed.

Placement matters. One diffuser covers a limited footprint; open floor plans may need more units. Avoid tucking it behind furniture that blocks airflow, and replace refills before they run dry because perceived benefit often fades when the cartridge is empty.

We give Feliway Classic a cautious positive score for low-risk trial value in mild cases. It is mid-range in ongoing cost and deserves realistic expectations. If fighting, elimination problems, or withdrawal worsen, stop guessing and book a veterinary behavior consult.

Keep spare refills on hand during holidays or construction so you do not accidentally run the diffuser empty during a stressful week.