Some cats need deeper barrier support because the problem is driven by inflammation, infection, or allergy—not just coat dryness. Red flags include scabs, hair loss in patterns (belly, inner legs), recurrent ear debris, or itch that interrupts sleep. In these cases, supplement comparisons like missing link vs pet gala cats matter less than getting the diagnosis right. A supplement can be part of a plan, but it should not delay testing for fleas, mites, ringworm, or secondary infection.
Vet visit prep: bring (1) photos of the worst days, (2) a list of all flea products used and dates, (3) the exact supplement label, and (4) notes on where the cat overgrooms. Ask the clinic: “Could this be flea allergy even if no fleas are seen?”, “Do ears and skin suggest yeast or bacteria?”, and “Should diet trial or allergy workup come first?” Clear questions shorten the path to relief.