The food bowl is not the only indicator of whether a cat's diet is right for it. What happens after a meal also provides a lot of information.
The frequency and consistency of stools, vomiting, regurgitation, or even hairballs can sometimes highlight an poorly tolerated diet, a transition that was too rapid, or simply a portion size that needs to be adjusted.
But beware: not every digestive issue is necessarily food-related. Observing your cat allows you to spot certain patterns, not to make a diagnosis yourself.
Stools: an interesting indicator of digestion
A cat's stools can vary slightly from one day to the next. What should mainly draw your attention is a change that repeats itself or becomes persistent.
Stools that are regularly very soft, liquid, particularly voluminous, or conversely, very dry may prompt you to take a closer look at their diet.
Several factors can be involved: the amount served, the digestibility of the food, its fat or fiber content, a recent change in food, or even the cat's individual tolerance to certain ingredients.
Frequency also counts. There is no perfect frequency that applies to all cats: diet, hydration, age, and the individual cat itself can cause it to vary.
The goal is therefore less about looking for a "perfect" stool than about knowing your own cat's usual habits and noticing when they change over time.
Soft stools after a change in diet
Changing kibble or wet food abruptly can disrupt the digestive system, even when the new food is of high quality.
The intestinal microbiota and the digestive system must adapt to a new composition. A gradual transition generally helps limit disorders linked to the change.
If stools consistently deteriorate when a food is introduced and improve when it is removed, this observation is worth taking into account.
However, this alone is not enough to confirm that a specific ingredient is responsible.
Vomiting or regurgitation: they are not exactly the same thing
We easily use the word "vomiting" as soon as a cat rejects something. However, regurgitation and true vomiting do not correspond to the same phenomenon.
During regurgitation, content may be expelled shortly after eating, often containing food that is still largely undigested and without significant abdominal effort.
Vomiting is an active phenomenon: it can be preceded by nausea, salivation, abdominal contractions, or retching.
This distinction can be useful when trying to understand what is happening and, above all, when describing symptoms to the veterinarian.
Can a cat that eats too fast throw up its meal?
Yes, some cats gulp down their food and reject it shortly after.
In this case, the food itself is not necessarily to blame. The way they eat can also be a factor.
Dividing the ration into several small meals or using a device to slow down their eating can sometimes help.
But repeated rejection should not automatically be attributed to "eating too fast." If it becomes frequent, the cause must be investigated.
And hairballs?
Cats naturally swallow hair while grooming. A large portion normally passes through the digestive system and is eliminated in the stool.
Nevertheless, it can happen that a mass of hair is rejected through the mouth.
The amount of hair swallowed depends in particular on the coat, the molting season, the frequency of grooming, and the individual behavior of the cat. Brushing can therefore play a role that is just as important as diet.
Diet does, however, play a role in digestive transit. Sufficient hydration and an appropriate amount of fiber can contribute to healthy digestive function.
This does not mean that a food labeled "anti-hairball" is automatically necessary for all cats.
Frequent vomiting should also not be considered normal under the pretext that the cat has fur.
Hydration is also part of nutrition
When we talk about digestion, we easily think of proteins, fats, or fibers, and much less about water.
Yet, the water contained in food also contributes to daily fluid intake.
Wet food contains much more water than dry food. For a cat that naturally drinks little, incorporating wet food can therefore help increase its total water intake.
This can also be important when stools are particularly dry or the cat is prone to constipation.
However, hydration alone does not solve all digestive problems.
Should an ingredient be removed as soon as a problem appears?
Not necessarily.
An isolated episode of soft stools or vomiting is not enough to conclude that a food or protein is poorly tolerated.
Before blaming an ingredient, look at the whole situation: recent diet changes, amount consumed, treats, eating too quickly, access to other food, stress, medications, parasites, or health issues can also be factors.
Increasing dietary changes at the slightest symptom can even complicate matters: when everything changes at the same time, it becomes difficult to know what actually improved or worsened the situation.
Observation over time is therefore much more useful than a succession of improvised changes.
When should you consult a vet?
Occasional vomiting or an unusual stool does not necessarily mean the cat is sick.
However, certain signs justify doing more than just changing their diet: repeated vomiting, persistent or severe diarrhea, the presence of blood, marked constipation, pain, loss of appetite, weight loss, lethargy, or significant changes in behavior.
A cat that repeatedly tries to vomit without managing to bring anything up also deserves special attention.
In these situations, diet should not be used to delay a veterinary consultation.
Observe before changing
Stools, vomiting, and hairballs provide interesting information about a cat's digestive function, but they must always be interpreted in context.
Before completely changing their diet, it can be useful to note for a few days what the cat eats, the quantities given, any extras, the frequency of stools and vomiting, as well as the circumstances in which they occur.
This simple observation often helps distinguish a one-time incident from a recurring problem and provides much more precise information if veterinary advice becomes necessary.
Key takeaways
A suitable diet must be evaluated based on what it contains, but also on how the cat tolerates it.
Stools are among the interesting indicators. Vomiting and regurgitation should be differentiated. Hairballs can be occasional, but should not serve as an automatic explanation for repeated vomiting.
Observing your cat, avoiding constant dietary changes, and knowing how to recognize situations that require a vet allows you to use these signs for what they really are: information on their digestive state, not a diagnosis in themselves.