My Dog Ate Ibuprofen Pm Pills. Symptoms of ibuprofen toxicity in a dog may include not eating, vomiting, black tarry stools, abdominal pain, weakness, lethargy, increased thirst and increased urination. Dogs with a dose of acetaminophen poisoning greater than 100 mg/kg show significant signs of poisoning.
If you suspect that your dog has eaten ibuprofen, then you should always contact your veterinarian immediately for advice. This is what causes stomach ulcers in many toxicity cases. Eating motrin or other forms of ibuprofen can cause serious illness and death.