You will be able to read a coat without hunting for a diagnosis: what separates a moult from a thinning patch, what scratching says that the fur does not, and why a glossy coat proves nothing.
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The coat is the first thing anyone looks at and the last thing to change. It does tell you something, weeks late, and it never names a cause.
Shine fades slowly, and you are there for every step of it. That is the worst seat in the house for noticing a change.
Photograph it in the same spot, in the same light, twice a year. The comparison does in three seconds what memory does not do at all.
Hair on the sofa, coming from the whole body, undercoat lifting away in tufts: that is a general shed, and it often follows the seasons or the central heating.
One defined area where skin starts to show, especially if it widens week by week, is nothing like it. Note where it is and how big it is, with a ruler lying beside it in the photograph: that is what the vet will ask for.
Dry air, baths too often, brushing too rarely, skin reacting to something else: the same small white flakes cover situations with nothing in common.
What counts is what comes with them. Flakes alone, in an animal eating, sleeping and moving as usual, do not tell the story that flakes with scratching and a new smell tell.
An animal can carry a faultless coat and scratch for half the evening. Fur runs behind the skin, and skin runs behind the discomfort.
Measure the scratching instead of judging it: how many times an evening, how long at a stretch, at what time of day. A week of notes beats an adjective, because a lot and often mean nothing down a phone line.
Film one bout of scratching or licking. It will not happen again in the consulting room.
Cats groom away from an audience, and when they overdo it they overdo it where you never look: the belly, the inner thighs, the base of the tail.
Turn it over once a month, or watch it stretch. Very short, even fur, as if clipped, with no patch and no redness, is an observation to report exactly as it is, with no conclusion attached.
Mats appear where the animal has stopped grooming. On a cat, the lower back and the base of the tail go first, because they are the hardest places to reach.
A cat that stops grooming has not turned careless. It is telling you that something makes the movement hard or unpleasant, and that belongs in the next appointment.
Fur takes weeks to reflect a change, and weeks to recover once the cause is dealt with. An animal can have been off for ten days with a coat still in perfect order.
The coat is a slow indicator. It sometimes confirms, it never reassures on its own, and it replaces neither weight, nor appetite, nor the way the animal moves.