Why Your Cat Eats Grass and Vomits
Cats frequently consume grass, a behaviour often followed by them vomiting. This common practice is generally not a cause for alarm and serves specific purposes for your feline companion. The primary reasons revolve around aiding their digestive processes, particularly in helping them to expel indigestible material like fur or bone fragments.
- Cats eat grass to help expel indigestible materials.
- Vomiting after eating grass is a natural digestive aid.
- It can help soothe an upset stomach or dietary upset.
- Occasional grass-eating and vomiting is normal feline behaviour.
While it might seem counterintuitive or concerning to see your cat deliberately ingest plants only to then be sick, it's a deeply ingrained instinct. The grass acts as an emetic, a substance that induces vomiting, or as a natural laxative. This action helps clear their digestive tract of things their bodies cannot process, such as hairballs that build up from grooming, or small indigestible items they might have ingested.
Think of it as your cat's natural 'medicine cabinet'. Unlike some domestic pets, cats are obligate carnivores, meaning their diet should primarily consist of meat. However, their wild ancestors would have consumed entire prey, including fur, feathers, and bones, which their digestive systems were equipped to handle. Modern domestic cats, even those on a balanced commercial diet, retain these ancestral instincts.
The Instinctive Need to Vomit
When a cat eats grass, its blades are difficult for them to digest. The rough texture tickles the stomach lining and throat, triggering the gag reflex. This is precisely what the cat often intends. By inducing vomiting, they can clear their stomach of hairballs, which are formed from the fur they swallow during grooming. If a hairball becomes too large to pass naturally, it can cause discomfort and potential blockages. Grass provides a natural, albeit messy, way to resolve this.
It's also a way to get rid of anything else that might be causing them discomfort. This could include small pieces of undigested food, or even tiny foreign objects they might have inadvertently swallowed. The act of eating grass, therefore, is a self-soothing and self-correcting mechanism.
The most common reason for grass-eating and subsequent vomiting is the expulsion of hairballs.
Grass as a Natural Laxative
If the grass doesn't trigger vomiting, it can move through the digestive system and act as a fibre source. This fibre can help move things along, essentially acting as a mild laxative. For cats experiencing constipation or a sluggish digestive system, this can be beneficial, helping to pass stool more easily. You might notice more frequent or softer stools if this is the case, rather than vomiting.
This dual-action capability – either inducing vomiting or promoting bowel movements – makes grass a versatile tool in a cat's natural health maintenance repertoire. It's a simple, accessible solution that evolution has provided them.
A cat that occasionally eats grass and vomits is exhibiting perfectly normal behaviour. It indicates their digestive system is functioning as nature intended, with the cat taking proactive steps to maintain its internal health.
Understanding the Grass Itself
Not all grass is created equal in a cat's eyes, and the type of grass they seek out often plays a role in their behaviour. Indoor cats, deprived of outdoor access, may turn to houseplants or specially grown cat grass. Outdoor cats have a wider variety of grasses to choose from, often preferring specific types that offer the right texture or perceived benefits.
When you provide cat grass indoors, you are essentially replicating a safe and controlled version of their natural foraging behaviour. This is crucial for their well-being, especially if they are indoor-only cats who might otherwise be tempted by toxic houseplants or lack fibre in their diet.
What is Cat Grass?
Cat grass is typically a mix of common cereal grasses, such as wheat, barley, oats, or rye. These are chosen because they are palatable for cats, easy to grow, and provide the necessary fibrous texture. It's important to ensure that any grass your cat consumes, whether grown indoors or found outdoors, is free from pesticides, herbicides, and other harmful chemicals. These substances can be toxic to cats and can lead to serious health issues, far more concerning than occasional vomiting.
Commercial cat grass kits are readily available from pet stores and online retailers. These kits usually contain seeds and a growing medium, designed for easy cultivation at home. Growing your own cat grass ensures you have a fresh, safe supply readily available for your pet.
Providing safe, chemical-free cat grass indoors is a proactive way to support your cat's digestive health.
Outdoor Grass Considerations
For cats that have access to the outdoors, they will naturally seek out grass. While most common lawn grasses are safe, owners should be mindful of areas that may have been treated with chemicals. If you use pesticides or herbicides on your lawn, it's essential to keep your cat away from these areas until it is safe, or provide a dedicated safe space for them to graze. Certain ornamental grasses or wild plants can also be toxic, so it's wise to be aware of what grows in your local environment.
If you're unsure about a plant's safety, it's always best to err on the side of caution and prevent your cat from eating it. The ASPCA has extensive databases of toxic and non-toxic plants for pets, which can be a valuable resource for pet owners.
The plant's fibrous structure is key; it's not about nutritional content in the way humans think of vegetables, but about physical action within the digestive tract.
When to Be Concerned: Signs Your Cat Needs Veterinary Attention
While eating grass and vomiting is a normal behaviour for many cats, there are times when it can signal an underlying health issue. It's important for owners to observe their cat's behaviour and recognise when their grass-eating habits might be more than just a simple digestive aid.
If your cat's grass-eating becomes excessive, or if they seem distressed or lethargic before or after vomiting, it warrants closer inspection. Persistent vomiting, especially if it contains blood, is a clear sign that veterinary advice is needed. Likewise, if your cat is not keeping any food or water down, or shows signs of dehydration, a vet should be consulted immediately.
Red Flags to Watch For
Several indicators suggest that your cat's grass-eating and vomiting behaviour may be more serious:
- Frequency: If your cat vomits more than once or twice a week, especially if it's not just grass or clear liquid.
- Vomiting Content: Vomiting blood, bile (yellowish fluid), or foreign objects that you know your cat shouldn't have ingested.
- Lethargy and Weakness: If your cat seems unusually tired, withdrawn, or weak after vomiting.
- Loss of Appetite: If your cat refuses food or water for more than 24 hours.
- Diarrhoea: Unexplained or persistent diarrhoea accompanying vomiting.
- Weight Loss: Unexplained or significant weight loss over a short period.
- Constipation: If your cat is straining to defecate or is unable to pass stool.
- Behavioural Changes: A sudden, drastic change in their normal behaviour, such as hiding excessively or showing aggression.
These symptoms, especially when occurring together, can indicate a range of problems, from gastrointestinal infections and parasites to more serious conditions like inflammatory bowel disease (IBD), pancreatitis, kidney disease, or even obstructions caused by ingesting non-food items.
Persistent vomiting or the presence of blood in vomit requires immediate veterinary assessment.
Potential Underlying Health Issues
When a cat eats grass and vomits due to an underlying medical condition, the grass-eating might be an attempt to self-medicate or a symptom of the illness itself. For instance, a cat with nausea due to a stomach upset might try to eat grass to bring up whatever is bothering them. If they have ingested something harmful, or if they have an infection, the vomiting might be more violent or contain unusual substances.
Conditions such as:
- Parasitic infections (worms)
- Gastrointestinal infections (bacterial or viral)
- Inflammatory Bowel Disease (IBD)
- Pancreatitis
- Kidney or liver problems
- Ingestion of toxins or foreign bodies
- Food allergies or intolerances
can all manifest with vomiting. If your cat is exhibiting any of the red flags mentioned, a prompt visit to your veterinarian is crucial for accurate diagnosis and treatment.
Your vet will likely ask about your cat's diet, grooming habits, access to outdoor areas, and the frequency and nature of the vomiting. They may perform a physical examination, and potentially recommend diagnostic tests such as blood work, faecal analysis, or X-rays to determine the cause.
How to Provide Safe Grass Options for Your Cat
If your cat enjoys eating grass, it's a good idea to provide them with safe, accessible options. This is particularly important for indoor cats who don't have natural access to lawns. Offering cat grass ensures they have an outlet for this behaviour without the risks associated with consuming potentially treated outdoor plants or toxic houseplants.
The goal is to satisfy this natural instinct in a way that is beneficial and safe for your feline friend. By offering appropriate grass, you can help prevent them from seeking out less desirable or dangerous plants.
Indoor Cat Grass Solutions
The simplest and most common solution is to grow cat grass at home. These are widely available as small starter kits from pet stores, garden centres, or online. These kits typically contain seeds (usually wheat, barley, oat, or rye) and a small pot with soil or a growing medium.
Growing cat grass is straightforward:
- Plant the seeds: Follow the kit's instructions, usually involving spreading seeds liberally in the pot and covering them lightly with soil.
- Water regularly: Keep the soil consistently moist but not waterlogged.
- Provide light: Place the pot in a location that receives adequate sunlight, such as a windowsill.
- Growth: The grass should sprout within a few days and be ready for your cat to nibble within one to two weeks.
Once it's grown to about 2-3 inches, you can offer it to your cat. It's a good idea to have a couple of pots growing at different stages so you always have fresh grass available. This ensures a continuous supply for your cat's grazing needs.
Alternatively, some pet supply stores sell small, pre-grown pots of cat grass, which can be a convenient option if you're in a hurry or prefer not to grow your own.
What to Avoid
It's crucial to avoid offering your cat grass that has been treated with pesticides, herbicides, or fertilisers. If you have a lawn, be certain it's free from these chemicals before allowing your cat to graze. If you're unsure, it's safer to provide a dedicated indoor source.
Also, be aware of common houseplants. Many popular plants, such as lilies, tulips, daffodils, and poinsettias, are toxic to cats. Even if they don't cause vomiting, they can lead to severe health problems. If your cat shows interest in houseplants, it's best to relocate them to a cat-safe area or choose only non-toxic varieties.
The key is to make a safe choice readily available so they don't need to seek out risky alternatives.
Dietary Contributions and Hairball Management
While grass serves as a natural emetic or laxative, it's also worth considering how your cat's primary diet might influence their need to eat grass and subsequently vomit. For obligate carnivores, a diet rich in meat is essential, but the fibre content and digestibility of their food can impact their digestive health.
Understanding the link between diet, grooming, and grass-eating can help you proactively manage your cat's well-being and potentially reduce the frequency of grass-induced vomiting, or at least ensure it's a healthy behaviour rather than a symptom of poor digestion.
Dietary Fibre's Role
Commercial cat foods vary in their fibre content. While cats don't require large amounts of fibre like herbivores, a certain level is necessary for healthy digestion. Adequate fibre helps to move food through the intestinal tract smoothly, preventing constipation and aiding in the passage of swallowed fur. If your cat's food is low in fibre, they might instinctively seek out grass to supplement this need.
Some cat foods are specifically formulated for hairball control. These diets often contain higher levels of fibre or specific ingredients designed to help move hair through the digestive system more effectively, reducing the formation of problematic hairballs. If your cat vomits hairballs frequently, discussing a diet change with your vet could be beneficial.
The right diet can significantly aid in managing hairballs and promoting healthy digestion.
Grooming Habits and Hairballs
Cats are meticulous groomers, spending a considerable amount of time cleaning their coats. This grooming process inevitably leads to them swallowing loose fur. For most cats, this swallowed fur passes through the digestive system without issue. However, in some cats, particularly long-haired breeds or those who groom excessively, fur can accumulate in the stomach, forming a hairball.
When a hairball becomes too large or irritating to pass naturally, the cat will often eat grass to induce vomiting. This is a far more comfortable outcome for the cat than a potential intestinal blockage. Regular grooming of your cat, especially if they have long fur, can help reduce the amount of loose hair they ingest, thereby reducing the likelihood of hairball formation and the subsequent need to eat grass to vomit.
Brushing your cat daily or several times a week can make a significant difference. Use a good quality brush designed for your cat's coat type to remove dead hair effectively.
When Grass Isn't Enough
If your cat is still frequently vomiting grass or hairballs despite a good diet and regular grooming, it might be time to consult your veterinarian. There could be an underlying issue causing excessive hair ingestion or difficulty passing it. For instance, a cat with skin issues that cause them to lick themselves more than usual might be ingesting more fur. Similarly, stress or anxiety can lead to over-grooming. Your vet can help identify and address the root cause.
Conclusion: A Natural Feline Phenomenon
The behaviour of cats eating grass and then vomiting is a deeply rooted, natural instinct. It serves as a vital self-maintenance mechanism for their digestive system, primarily aiding in the expulsion of indigestible material like hairballs and assisting overall gut health.
For most feline companions, this behaviour is a normal part of their routine. Providing safe, accessible sources of cat grass indoors can satisfy this instinct without exposing them to potential hazards from outdoor plants or toxic houseplants. Regular grooming and a balanced diet also play crucial roles in supporting their digestive well-being and can potentially reduce the frequency of grass-induced vomiting.
However, it is essential to remain vigilant. While occasional grass-eating and vomiting are normal, any drastic changes in frequency, content of vomit, or accompanying symptoms like lethargy, loss of appetite, or diarrhoea, should prompt a visit to your veterinarian. These signs might indicate an underlying health concern that requires professional diagnosis and treatment.
Understanding this common behaviour allows you to better support your cat's health and comfort.
By observing your cat and ensuring they have safe outlets for their natural instincts, you can help them maintain a healthy, happy life. The grass is greener, as they say, for a reason when it comes to feline health – it’s a sign of a cat taking care of itself.