Loss of appetite: when a cat or dog stops eating and what to do

The word inappetence covers very different situations. An animal in true anorexia touches nothing, not even a food it has always loved and not even a treat offered by hand. An animal with reduced appetite eats, but less than usual and with little enthusiasm. An animal that is simply fussy refuses its regular ration but readily accepts something tastier: this third case is almost never an appetite problem, it is a preference problem, and it has to be handled in the opposite way to the other two.

The distinction is practical, not academic. Giving in to a cat that ignores its kibble but devours tuna teaches the animal that refusing is the way to get something better, and within a few days you have a cat that will only eat an unbalanced food. By contrast, an animal that refuses even the tastiest morsel is signalling something about its body, not its taste, and that deserves clinical attention.

A single meal left in the bowl is rarely an emergency. A dog that has had plenty of scraps during the day, a cat put off by heat, an animal recovering from a recent vaccination can all eat less for a few hours with nothing wrong. The signal that matters is not the isolated meal but the trend: an appetite that drops and does not recover, or a refusal repeated meal after meal.

This is why a written record helps more than memory. Noting how much and when the animal eats, with the Animiyo diary or even on paper, turns a vague impression into a fact: the vet who asks how long it has not eaten gets a precise answer instead of a maybe a couple of days, and that difference shapes decisions. The same holds for weight, which in a prolonged drop falls before the eye can notice.

• Record every refused meal with the time, not just the fact that it happened.
• Note symptoms that appear in the same hours: vomiting, loose stools, apathy, hiding.
• Weigh the animal on the same scale: weight loss makes urgent what looked mild.
• Separate a total refusal from eating little: they are two different pieces of information.

In a dog a short fast, in an adult and healthy animal, is usually well tolerated. In a cat the same situation carries a different weight. The feline metabolism is not built to handle periods of fasting: when food intake stops, the body starts moving fat reserves towards the liver, which can be overwhelmed. The result is hepatic lipidosis, a build up of fat in the liver that impairs its function and can turn serious within a few days, especially in an overweight cat that suddenly stops eating.

This difference does not mean loss of appetite is trivial in dogs, it means the cat has less margin. When in doubt, the prudent rule is to treat feline loss of appetite as a reason for earlier contact with the vet than you would consider for a dog of the same age and in the same condition.

The reasons an animal stops eating are many, but they sort into a few families. Recognising the family helps you see whether the most useful move is to change the environment, adjust how food is offered, or go straight to the vet.

Oral pain deserves a separate mention because it is common and often invisible from the outside. An animal with a painful tooth may be hungry, approach the food with interest and then pull back at the first contact: that gesture, repeated, is a valuable clue to report to the vet.

Faced with an animal that will not eat, the most common move is to change the food. Sometimes it works, and that is exactly what makes it dangerous: novelty can wake the appetite for a day or two through surprise, while the real cause stays in place. If an illness sits under the loss of appetite, the food change hands you the illusion of a fix and costs precious time, all the more in cats.

There is a flip side too. Changing food abruptly in an already struggling animal adds a second problem, digestive upset from a rushed transition, on top of the first. If a change is needed, it should be gradual and for a defined reason, not a blind attempt repeated every couple of days with a different food.

When loss of appetite is mild, recent and without alarming symptoms, a few adjustments help the animal start eating again without changing the diet. These are changes to how the food is presented and to the environment, not to the composition of the ration.

1. 1

   Warm the wet food slightly

   Bringing wet food to body temperature, never hot, releases its aroma and makes it more inviting. Always check the temperature with a finger before serving so you do not scald the animal's mouth.

2. 2

   Work on the texture

   Soft or moistened food is easier to eat for an animal in oral pain or with little drive. Breaking up or softening dry food with a little warm water can help, staying within the planned ration.

3. 3

   Offer the meal in a calm place

   A bowl away from noise, from other animals and from the cat's litter tray lowers stress. Many animals that refuse in a busy spot accept the same food in a quiet corner.

4. 4

   Check freshness and the bowl

   A bag open for weeks loses aroma and can go rancid. Plastic bowls hold unpleasant smells: clean steel or ceramic are often preferred, especially by cats.

5. 5

   Do not turn the meal into a battle

   Forcing, chasing or punishing does not help and worsens the association with food. If after reasonable attempts the animal keeps refusing, the next step is the vet, not more insistence.

These measures apply to a mild and passing drop. They do not replace a clinical assessment when loss of appetite lasts, worsens or comes with other signals. In that case, time spent making the food tastier is time taken from diagnosis.

There is no number of hours that fits every animal, and be wary of anyone who promises one. There are, however, common sense thresholds that account for species, age and the symptoms present. The table below gives prudent criteria: they are starting points for deciding when to pick up the phone, not clinical certainties, and whenever in doubt the safest choice is to bring the call forward.