Poisoning in Cats - Common Causes, Symptoms & Treatment | Cat Health Collection

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Cat World > Cat Health > Poisoning in Cats - Common Causes, Symptoms & Treatment

Poisoning in Cats - Common Causes, Symptoms & Treatment

Symptoms of poisoning  10 most common cat poisons   How do cats become poisoned?    Diagnosing poisoning   How is poisoning treated?   Avoiding poisoning in cats

poisoning in cats

Despite cats having a reputation for being somewhat picky, sadly this is not the case and every year many cats succumb to poisoning. Almost all poisonings are life-threatening and require immediate veterinary attention if your cat is to stand any chance.

Poisoning may be accidental, such as a cat eating something he shouldn't, or having something spilled onto his coat, or deliberate (feeding the cat baited food etc).

Poisons can affect many body systems including:

  • Cardiotoxin - Toxins which affect the heart
  • Neurotoxin - Toxins which affect the nervous system
  • Dermatoxin - Toxins which affect the skin
  • Enterotoxin - Toxins which affect the intestines
  • Hemotoxin - Toxins which affect the blood
  • Hepatotoxin - Toxins which affect the liver
  • Nephrotoxin - Toxins which affect the kidneys
  • Ototoxin - Toxins which affect the ear and vestibular system
  • Genitotoxin - Toxins which affect the reproductive and urinary system
  • Immunotoxin - Toxins which affect the immune system

Ten most common cat poisons

Below is a list of the ten most common poisons ingested according to the Pet Poisons Hotline.

  1. Topical insecticides
  2. Household cleaners
  3. Antidepressants
  4. Lillies
  5. Insoluble oxalate plants (Dieffenbachia, Philodendron)
  6. Cold and flu medication
  7. Tylenol (paracetamol)
  8. Glow sticks
  9. ADHD medications/amphetamines
  10. Rat poison

The most commonly searched articles on Cat-World are:

  1. Chocolate (theobromine)
  2. Aspirin
  3. Lillies
  4. Tylenol (paracetamol)
  5. Pyrethrin
  6. Antifreeze (ethylene glycol)
  7. Snail bait
  8. Ibuprofen (Advil/Nurofen)
  9. Rat poison
  10. Lead

Note: Cat-World hasn't covered all possible poisons listed by the Pet Poison Hotline, which obviously affects results.

How do cats become poisoned?

The most common route is ingestion of a toxic substance orally. Other routes of toxicity may include via direct contact with the skin, injection, aerosol (inhaled).

Medication: It is very common for cats to be poisoned by a well-meaning owner who administers a medication which is toxic to the cat, accidental overdose of a medication prescribed to your cat is also a possibility.

Food: There are a number of human foods which are toxic to cats. It is common to believe that cats won't consume foods which are harmful to them but this is not always the case. Avoid giving your cat human foods, and don't leave food lying around where your cat can get into it. Cats aren't little people and they metabolise a number of foods differently to us.

Inappropriately prepared home diets can also be a problem as they may contain high levels of vitamin D or vitamin A which are both toxic in high doses. Organ meats, in particular, should be limited (but not completely withheld) due to the potential for toxicity. Vitamin toxicity can also occur in cats who have been given vitamin supplements or cod liver oil.

Food poisoning is another common cause of poisoning in cats. Eating garbage or feeding food which is out of date, improperly stored or improperly handled. While most cases aren't life-threatening in healthy adult cats, kittens, senior cats and cats who are immunocompromised are at greater risk. There is a move towards a more natural diet for cats, which is great, but care must be taken. I always recommend feeding human grade meat and practicing strict hygiene when preparing and storing food.

Secondary poisoning: This occurs when your cat eats an animal who has ingested poison. The most common being bated rats or mice. Wild caught meat such as rabbit and kangaroo many contain lead fragments which are toxic to cats.

Inhaled: Dusts (such as lead), chemicals, fumes, smoke, insecticides, gases can all be inhaled causing a variety of toxic and respiratory symptoms.

Poisons which contaminate the coat: These are absorbed directly through the skin or ingested when the cat licks itself.

Deliberate poisoning: It is not uncommon for cats to be deliberately poisoned by disgruntled neighbours. This is why I try to avoid listing the toxic dose of common medications on this site.

Insect, reptiles, arthropods: There are many species of snake, insect and arthropods which are poisonous to cats. Most become poisoned during hunting.

Poisoning may be acute or chronic (over a prolonged period of time such as vitamin toxicity).

Symptoms of poisoning in cats

You may notice from the list below some poisons listed under different categories, that is because some can cause poisoning in more than one way.


  • Snail bait
  • Plants (lily is a notoriously dangerous plant to cats and even the smallest amount can be fatal)
  • Antifreeze
  • Certain foods, especially human foods can cause toxicity in cats. Common foods include onion, macadamia nuts, garlic, tomato, and chocolate.
  • Medications such as aspirin. Only ever give your cat medication your veterinarian has prescribed and never give medications for other animals or humans.
  • Flea collars
  • Metals such as zinc from coins or lead


  • Household cleaners including bleach, disinfectants (particularly those containing phenol, which turns white in water), laundry detergent
  • Antifreeze
  • Insecticides (to kill ants, wasps etc) or dog flea products which are highly toxic to cats
  • Flea collars



  • Snake bite (or insect, spider etc)
  • Medications or drugs

Symptoms may vary somewhat depending on the poison ingested, symptoms can be varied and affect many body systems including gastrointestinal upset, breathing, urination and the central nervous system.

Gastrointestinal and urinary

  • Anorexia (loss of appetite)

  • Abdominal pain

  • Vomiting, possibly with blood
  • Diarrhea, possibly with blood
  • Blood in cat stool
  • Blood in the urine
  • Dark coloured urine
  • Increased or decreased urination
  • Inability to urinate at all (this can occur in cats whose kidneys have been damaged due to antifreeze poisoning)

Note: Blood in vomit, feces or urine may indicate your cat has developed a blood clotting disorder for example with rodenticide.

Central nervous system

  • Muscle twitching/tremors

  • Change in behaviour, anxiety, confusion, excitability etc
  • Ataxia (loss of coordination)
  • Increased salivation
  • Incoordination
  • Seizures
  • Loss of consciousness


  • Increased heart and respiratory rate (cardiac/respiratory hyperactivity may occur if your cat has ingested a stimulant such as theobromine or caffeine)
  • Respiratory distress (difficulty breathing, rapid breathing, shallow breathing)
  • Change in gum colour due to cyanosis
  • Coughing
  • Loss of consciousness


Any kind of poisoning should be seen by a veterinarian. In the meantime, remove your cat from the source of poisoning. Call your vet to let them know you are coming in and what poison your cat has ingested. He may give you some instructions over the phone.

  • If he has a collar on, remove it.
  • Any contamination of the coat should also be removed with a cloth. Do not use soap and/or water until you have spoken to your veterinarian.
  • Do not induce vomiting unless instructed to do so by your veterinarian.

AnchorHow is poisoning diagnosed?

If you suspect your cat has been poisoned, seek veterinary attention immediately. Where possible, bring along a sample of the plant or poison (including the packaging) as well as samples of vomit, feces and urine if you are able to. Your veterinarian will perform a complete physical examination including evaluating the size and shape of the internal organs, looking for bites or other evidence of toxicity and obtain a medical history from you including possible exposure to toxins, any medication your cat is currently on, or has been given. Tests may vary depending on the suspected poison but may include:

  • Complete blood count, urinalysis and biochemical profile to evaluate organ function and look for abnormalities in normal values.
  • Imaging such as ultrasound or x-ray may be required to look for foreign objects which may have been consumed.
  • Blood clotting profiles.
  • Arterial blood gas.
  • Snake venom test kit if your cat has been bitten by a snake can help your veterinarian identify the type of snake.

AnchorHow is poisoning treated?

Treatment will depend on the cause of poisoning, but may include:

Gastric decontamination-Removing unabsorbed poisons and/or preventing further absorption from the cat where possible. This includes the following:

  • Induce vomiting to prevent further absorption of the poison.

  • If pumping the stomach is not possible, your vet may choose to pump the stomach instead.

  • Activated charcoal will be given to absorb the remaining poison.

Contraindications may include if the cat is unconscious or if the poison is corrosive.

Supportive care:

  • If your cat is having seizures, he may be given anti-seizure medication to bring them under control.

  • If muscle tremors are occurring, muscle relaxants such as diazepam may be administered.

  • Fluid therapy to control acidosis (high levels of acid in the blood), and correct dehydration. This also helps to flush out any remaining toxins from the body.

  • Blood transfusion may be necessary for cats who have become anemic.
  • Oxygen therapy in cats who are having difficulty breathing.

Toxin specific therapy:

  • Administration of ethanol as soon as possible in the event of antifreeze poisoning.

  • Chelation therapy for cats who have lead or zinc poisoning. This medication combined to lead in the blood and is excreted out of the body via the urine.

  • Vitamin K will be administered to cats who have ingested rat poison. Rodenticide works by blocking the synthesis of vitamin K which is needed by the body to make certain clotting factors.

  • Atropine may be administered to cats who have ingested snail bait. This drug counteracts the effect of the toxin on your cat's nervous system.

  • Antivenom will be given to cats who have been bitten or stung by a venomous insect or animal (snake, tick). This life-saving product is obtained from the serum (the straw like portion of blood) of animals (commonly horses or sheep) who have been exposed to small doses of venom and have produced antibodies against the venom.

  • Vitamin C and/or N-acetylcysteine (NAC) may be given to cats who have ingested paracetamol (acetaminophen). These can assist with the detoxification and elimination of the toxin.

  • Medications to protect the lining of the stomach such as ranitidine, cimetidine or famotidine for cats who have ingested ibuprofen. 

AnchorHow to avoid poisoning in cats

  • Keep all chemicals out of the way of your cat.

  • Don't feed your cat human foods.

  • If you have houseplants, make sure they are not toxic to your cat.

  • Don't give your medications to pets unless instructed to do so by a veterinarian.

  • Make sure you notify any pest control people that you have pets when the house is sprayed. They will be able to offer pet-friendly alternatives.

  • Prevent your cat from free roaming and hunting.

  • Be careful when renovating old houses, lead toxicity can occur when sanding back walls with old paint containing lead.

  • If your cat is on medications, one member of the household should be designated to administer them to avoid your cat being given medications by more than one person.

  • Keep all medications out of reach of cats.

  • Be careful with household cleaners. Where possible, try to use cat-friendly products.

  • Clean up any chemical spills immediately.

Last updated 15th February 2017.



Poisoning in Cats - Common Causes, Symptoms & Treatment | Cat Health Collection
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Poisoning in Cats - Common Causes, Symptoms & Treatment | Cat Health Collection