Signs of Poisoning in Dogs

Symptoms of poisoning vary widely depending on what your dog has eaten, how much, and their size. Some symptoms are obvious and appear quickly, whilst others are subtle and develop slowly. Knowing what to look for is critical—do not wait for symptoms to appear if you suspect poisoning. Call your vet immediately.

Early Warning Signs (First 0–6 Hours)

These symptoms often appear within the first few hours of ingestion:

Gastrointestinal Symptoms

• Vomiting — One of the most common early signs; may be projectile or forceful
• Drooling — Excessive salivation, sometimes profuse
• Nausea — Retching without vomiting, lip smacking, swallowing frequently
• Loss of appetite — Refusing food or treats
• Diarrhoea — Watery or loose stools
• Abdominal pain — Whimpering, reluctance to move, hunching, or restlessness

Neurological Symptoms

• Lethargy — Unusual tiredness, lack of interest in play or activities
• Restlessness — Pacing, inability to settle, anxiety
• Disorientation — Confusion, bumping into things, appearing lost in familiar spaces
• Tremors — Shaking or trembling, especially in limbs or jaw
• Lack of coordination — Stumbling, falling, difficulty walking

Other Early Signs

• Excessive thirst — Drinking much more than normal
• Rapid breathing — Panting more than usual
• Rapid heartbeat — Visible increased heart rate
• Pale gums — Gums should be pink; pale gums indicate poor circulation or shock

Progressive Symptoms (Hours to Days)

If poisoning is not treated, symptoms may progress to more severe signs:

Severe Gastrointestinal Distress

• Persistent vomiting — Vomiting multiple times or ongoing
• Bloody vomit — Indicates internal bleeding or severe GI irritation
• Bloody diarrhoea — Red or black stools (black indicates older blood)
• Inability to keep water down — Severe dehydration risk
• Abdominal swelling — Indicates bloating or fluid accumulation
• Severe abdominal pain — Crying out, refusing to move

Neurological Deterioration

• Seizures — Uncontrolled muscle contractions, loss of consciousness
• Muscle rigidity — Body stiffness, difficulty moving
• Loss of consciousness — Unresponsiveness, coma
• Difficulty breathing — Laboured or rapid breathing, gasping

Cardiovascular Symptoms

• Irregular heartbeat — Arrhythmias (detectable with stethoscope)
• Pale or blue gums — Indicates oxygen deprivation or shock
• Collapse — Loss of ability to stand
• Shock — Pale gums, rapid weak pulse, extreme lethargy

Other Serious Symptoms

• Seizures
• Uncontrollable tremors
• Loss of bladder or bowel control
• Extreme lethargy or unresponsiveness
• Difficulty urinating or defecating

Delayed Symptoms (Days to Weeks)

Some poisonings cause internal damage that does not show obvious symptoms until days or weeks later:

Kidney Failure (from Grapes, Lilies, etc.)

• Reduced urination — Passing very small amounts or no urine
• Increased thirst — Drinking excessively
• Bad breath — Uremic smell, ammonia-like odour
• Oral ulcers — Sores in mouth or gums
• Loss of appetite — Refusing food
• Lethargy — Extreme tiredness
• Dehydration — Dry gums, loss of skin turgor
• Vomiting — May appear later as kidney function declines

Liver Failure (from Xylitol, Sago Palm, etc.)

• Jaundice — Yellowing of skin, gums, whites of eyes
• Lethargy — Extreme tiredness, lack of interest
• Loss of appetite — Refusing food
• Vomiting — Persistent or worsening
• Abdominal pain — Hunching, reluctance to move
• Easy bruising — Bleeding disorders develop
• Bleeding — From mouth, nose, or in urine/faeces
• Pale gums — Indicating liver dysfunction

Bleeding Disorders

• Easy bruising — Bruises from minor trauma
• Bleeding from gums — Spontaneous bleeding
• Nosebleeds — Spontaneous bleeding from nostrils
• Blood in urine — Dark red or brown urine
• Blood in faeces — Black tarry stools (melena) or bright red blood

Poison-Specific Symptoms

Chocolate Poisoning

• Rapid heartbeat — Tachycardia (racing heart)
• Tremors — Muscle shaking, especially legs
• Vomiting and diarrhoea — Within 6–12 hours
• Restlessness — Pacing, inability to settle
• Seizures — In severe cases
• Cardiac arrhythmias — Detected by vet with stethoscope/ECG

Xylitol Poisoning

• Lethargy — Extreme tiredness, weakness
• Confusion — Disorientation, confusion
• Loss of coordination — Stumbling, falling
• Seizures — Potential with severe hypoglycaemia
• Rapid heartbeat — Tachycardia
• Tremors — Shaking, muscle twitching

Symptoms can appear within 30 minutes and be life-threatening.

Grape/Raisin Poisoning

• Vomiting — Often the first sign
• Diarrhoea — Loose or watery stools
• Loss of appetite — Refusing food
• Lethargy — Unusual tiredness
• Abdominal pain — Reluctance to move, whimpering
• Reduced urination — Key sign of kidney damage
• Dehydration — Develops as kidney function declines

Symptoms may not appear for 24–72 hours, and kidney damage may be silent.

Alcohol Poisoning

• Intoxication — Incoordination, stumbling, swaying
• Rapid breathing — Panting, laboured breathing
• Lethargy — Extreme tiredness
• Drooling — Excessive salivation
• Tremors — Shaking, muscle twitching
• Vomiting — May occur
• Loss of bladder control — Urinating involuntarily
• Seizures — In severe cases

Symptoms appear within 15–30 minutes.

Onion/Garlic Poisoning

• Vomiting and diarrhoea — May appear within hours
• Lethargy — Unusual tiredness
• Loss of appetite — Refusing food
• Pale gums — Indicates anaemia (develops over days)
• Jaundice — Yellowing of gums and eyes (indicates anaemia)
• Dark-coloured urine — Red or brown urine (haemoglobin in urine)
• Rapid breathing — Due to anaemia
• Weakness — From anaemia

Symptoms may develop over days as red blood cells are destroyed.

Macadamia Nut Poisoning

• Weakness — Especially in hind legs
• Tremors — Muscle shaking
• Fever — Elevated body temperature
• Rapid heartbeat — Tachycardia
• Abdominal pain — Reluctance to move
• Lethargy — Unusual tiredness

Symptoms appear within 1–6 hours and typically last 24–48 hours.

Silent or Subtle Symptoms

Some of the most dangerous poisonings cause silent internal damage with few external symptoms:

• Kidney failure from grapes — May show no symptoms until massive damage has occurred
• Liver failure from xylitol — Can develop silently before acute collapse
• Poisoning from certain plants — May cause minimal symptoms before organ failure

This is why calling your vet immediately is critical. Do not assume your dog is fine just because they seem outwardly normal.

When to Seek Immediate Emergency Care

Seek immediate emergency care (call the vet now, do not wait for appointment) if:

• Unconsciousness or unresponsiveness
• Difficulty breathing or gasping
• Severe or uncontrollable vomiting
• Bloody vomit or faeces
• Seizures or fitting
• Muscle tremors or rigidity
• Severe abdominal pain or swelling
• Collapse or inability to stand
• Pale, blue, or yellow gums
• Signs of shock (pale gums, rapid weak pulse, extreme lethargy)
• Suspected ingestion of highly toxic substance (xylitol, grapes, chocolate in large amounts, lily, sago palm)

Timeline: When to Worry

| Time | Action | | --- | --- | | Immediately | If ingestion of toxic substance is confirmed, call vet immediately | | Within 1 hour | Transport to vet if directed; vomiting induction may still be effective | | Within 2–6 hours | Activated charcoal may help; continue monitoring | | Beyond 6 hours | Toxin likely absorbed; focus on supportive care and monitoring | | Days to weeks | Monitor for delayed symptoms (kidney failure, liver failure, bleeding) |

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