Health & Medical

Here is something that catches most owners off guard. A healthy dog can go the better part of a week without eating and, given water and a bit of luck, come through it more or less intact. A cat cannot. Somewhere around the second or third day of an empty bowl, a cat's metabolism starts doing something actively dangerous to itself, and by the end of the first week it can be fighting for its life. The condition has a name that sounds far too gentle for what it does: hepatic lipidosis, or fatty liver.

The mechanism is worth understanding because it explains why the timeline is so short. When a cat stops eating, the body does the obvious thing and mobilises stored fat for energy, shipping it to the liver to be processed. The problem is that the feline liver is not especially good at handling a sudden flood of fat. It was built for a strict carnivore taking in a steady trickle of protein, not for an emergency famine response. Fat accumulates inside the liver cells faster than they can export it, the cells swell and stop working properly, and liver function begins to fail. A failing liver makes the cat feel nauseated and even less inclined to eat, which mobilises more fat, which worsens the liver. Once that loop is turning, it does not stop on its own.

The cats most at risk are the ones with the most fat to mobilise. An overweight cat who stops eating is in a considerably worse position than a lean one, and this is why vets get twitchy about crash diets. Cutting an obese cat's ration sharply, or switching to a food it flatly refuses and waiting to see who blinks first, is one of the classic ways this gets triggered at home. Feline weight loss has to be slow and supervised, and a cat on hunger strike over a new food needs a plan, not a battle of wills.

Almost anything that puts a cat off food can start it. A house move, building work, a new baby, a boarding cattery, a housemate guarding the bowl. Or a medical cause hiding underneath: painful teeth, pancreatitis, inflammatory bowel disease, kidney disease, a foreign body, a tumour. Hepatic lipidosis is nearly always secondary to something else, which becomes important later.

Early on the signs are quiet and easy to rationalise. The cat picks at food, then ignores it. It hides, sits hunched, grooms less, and the coat looks unkempt. Weight comes off surprisingly quickly, and owners often notice the spine and hips before they notice the appetite. Drooling and vomiting can appear. Then comes the sign that changes everything, which is jaundice. Yellow shows up first in the whites of the eyes, in the thin skin inside the ear flaps and on the gums, and it is easiest to see in daylight rather than under a lamp. A yellow cat is not a wait-and-see cat. In advanced cases the toxins a failing liver can no longer clear start affecting the brain, and the situation becomes critical.

The rule worth writing on the fridge: a cat that has eaten nothing at all for forty-eight hours needs a vet, not another day of monitoring. If it is also vomiting, hiding, or looks yellow anywhere, that is a same-day visit. This is one of the few situations where a couple of days genuinely changes the outcome.

Diagnosis is usually straightforward once the cat is in front of a vet. The exam finds a thin, jaundiced, often dehydrated cat with an enlarged liver on palpation. Bloodwork typically shows raised liver enzymes in a characteristic pattern along with raised bilirubin. Ultrasound shows a liver that looks unusually bright and enlarged, and it lets the vet inspect the pancreas, bile duct and intestines for the underlying trigger. Where confirmation is needed, a fine needle aspirate shows liver cells stuffed with fat. Clotting is checked before any needle goes in.

Treatment is less complicated than it sounds and comes down to one word: calories. Intravenous fluids correct dehydration, and potassium and phosphate need watching closely as feeding resumes. Anti-nausea medication makes the cat feel less awful. Appetite stimulants have a role, but relying on them alone in an already jaundiced cat wastes days it does not have.

Which brings up the feeding tube, and the way owners react to it. Many hear the words and assume the vet is describing a last resort, or that agreeing to one means their cat is beyond help. The opposite is closer to the truth. A narrow tube passed through the nose covers the first day or two, and where longer support is needed an oesophagostomy tube is placed under a short anaesthetic through the side of the neck. The cat eats and drinks normally around it, wears a light bandage, and goes home with the owner syringing a liquid diet through the tube several times a day. It removes the fight over food entirely. Most owners who dread the idea end up saying it was the easiest part.

Recovery is measured in weeks rather than days. The tube typically stays in until the cat is eating a good proportion of its requirement voluntarily, which can be two to six weeks, sometimes longer. Cats caught early and fed properly often do very well. Cats that arrive severely jaundiced and collapsed have a harder road, and no vet can promise how it will go. Costs vary a great deal with the length of hospitalisation, and asking for updated estimates as you go is entirely reasonable.

The last piece is the one that gets skipped. Fixing the liver without finding out why the cat stopped eating simply sets up a repeat. Whatever the trigger was, it needs identifying and addressing before the tube comes out. None of this substitutes for your own vet's examination, but the single most useful thing an owner can do is notice the empty bowl on day two rather than day five.