Poisoning can occur if a poisonous substance is swallowed (solids or liquids), breathed in (gases) or absorbed through the skin (normally liquids). Poisons are substances that damage the cells in the body. In order to cause harm they must enter the body. Many poisons are products we use every day and can be found in food, medications, and household substances. Accidental poisoning in dogs and cats is usually caused by substances we commonly have around the house, eg human medications and pest control products

What are the common poisons in pets?


One of the most common causes of accidental poisoning in pets is owners giving human medication to their pet - often for pain relief. Never give medication to your pet unless instructed to do so by your vet.

Although ibuprofen can be bought in any chemist as a painkiller for humans it is extremely toxic to dogs (and cats). Just one tablet can cause gastric ulceration, liver damage, kidney failure and death. It is one of the most common causes of poisoning in pets.

Dogs and cats cannot break down paracetamol safely and toxins quickly build up to dangerous levels - as little as half a 500mg tablet can kill an adult cat.

Slug pellets
The most common form of slug pellets contain metaldehyde. Dogs often find slug pellets attractive and will wander around the garden hoovering up pellets from treated areas. The poison causes excitement and seizures followed by depression and collapse. Avoid the use of chemicals in the garden if you have pets or confine your pets indoors or fence off treated areas.

Rat poison
Many rat poisons contain coumarins (warfarin or newer products with similar effects). Dogs often eat the poison directly whilst cats are most likely to be poisoned by eating a rodent already poisoned. Animals remain well for several days after eating the poison until their clotting factors are depleted. Repeated small doses are more toxic than single large doses. Signs include depression, weakness, breathing problems, and prolonged bleeding from any minor wounds or abrasions. Poisoned animals can bleed to death without treatment.

Dogs quite commonly eat cannabis but it rarely causes serious side-effects. Most affected dogs become excited and may salivate a lot. Sometimes affected pets will seem disorientated and may hallucinate - just as in people, appetite may be increased.

Food stuffs (Raisins, Onions and Chocolate)
Pets can be poisoned by human foodstuffs and these poisonings can be fatal. Raisin poisoning causes damage to the kidneys, chocolate poisoning affects the brain and onion poisoning can cause anaemia. In animals which are susceptible to these poisonings even a small amount (a piece of fruit cake, a few squares of dark chocolate) can have serious effects.

Adder bites
Snake bites are rare in most of the UK (although may be seen more often in some areas eg Cornwall). Three factors affect the seriousness of snake bites:

    • size of animal bitten
    • location of bite
    •  type of snake
  • Adder bites may require antisera - in general dogs require more antisera then humans.

Antifreeze has a sweet taste which is palatable to dogs and, more surprisingly, also to cats. Always keep antifreeze solutions out of the reach of pets. As little as 1 tsp per kg can kill (so a Labrador may only need to drink 100ml to be poisoned). The severity of the effects depends on the how quickly the poison is absorbed from the stomach and this is slowed by the presence of food in the stomach (in the absence of food the poison rapidly enters the bloodstream). Signs (vomiting, wobbliness/weakness, dehydration, and thirst) occur within 1 hour of poisoning. Mildly affected animals develop kidney failure (which might be treatable if caught early) whereas more severe cases have seizures or go into a coma.

Toad poisoning
The common toad is relatively harmless but all toads have glands in their skin which secrete unpleasant substances. Animals that have put toads in their mouth show excessive salivation and may paw at their mouth. Usually the signs resolve without treatment (pets may appreciate having their mouth washed out with a hose). In more severe poisonings signs include weakness, limb swelling and seizures.


Related topics


How can I stop my pet being poisoned?


Almost all cases of poisoning are accidental so the best way to prevent poisoning is to ensure that all poisons are kept out of reach of your pets (and children):

  • Dispose of unwanted medicines safely.
  • Put pest control products in pet-proof containers before putting them out.
  • Be vigilant when walking your dog to ensure it does not pick up any unusual things.

Younger animals are more likely to be affected as often chew strange objects. Cats are less likely to be poisoned than dogs as they are naturally more suspicious of novel substances. Cats may be poisoned by licking off substances spilt on, or applied to, their coat.


What can I do if my pet is poisoned?


A rapid response is critical in cases of poisoning. If you suspect that your pet may have been poisoned:

  • Protect the pet and remove it from the source of the intoxication
  • Don't let other people handle your pet (disorientated or frightened animals may become aggressive and other people may be contaminated with the poison)
  • Allow animals to drink water which may dilute ingested poisons
  • Contact your vet for further advice and be prepared to take your pet to the practice.
  • If your pet has a toxic substance on its skin or coat the worst of the contamination may be washed off to reduce further absorption. Protective clothing must be worn and water only should be used - make sure you do not get contaminated in the process.



Getting urgent veterinary advice


The sooner a poisoned animal receives treatment, the higher its chances of recovery. If you think that your pet has been poisoned then contact us immediately, your pet's life may well depend on it. It is always better to phone in advance to warn the surgery that you are on your way. This will give them time to prepare everything they need and for you to check that there is someone available at the surgery to help you.

In most cases the best course of action is to get your pet to the veterinary surgery as soon as possible. However, in some cases you may be advised to give some immediate first-aid treatment at home. If your pet is already showing signs of poisoning do not attempt to make it vomit or drink anything but seek immediate veterinary care.


What information will help us?

On arrival at the practice we will assess your pet immediately and make sure that its condition is stable before any other treatments are instigated. We will want to know:

  • If your pet has known access to possible poisons 
  • If so what poison
  • When your pet had access to the poison
  • How much was eaten or drunk
  • If your pet is receiving any medication

If you are able to take a sample of the poison or any packaging associated with it then this may help your vet to provide the best care for your pet.