Dog Sick After Parasite Treatment? What to Do and When to Call the Vet

Adverse reactions to flea/tapeworm treatments can occur. Act promptly.

Immediate Steps

1. Stop the product.
2. Bathe with mild dish soap (Dawn) to remove topical residue.
3. Contact your veterinarian immediately.

Signs of Toxicity

• Vomiting, diarrhea, hypersalivation
• Tremors, ataxia, seizures
• Lethargy, weakness
• Skin redness, hives, itching at application site
• Difficulty breathing

High-Risk Situations

• Wrong product (dog vs. cat, weight mismatch)
• Overdose
• Concurrent medications
• MDR1 mutation (collies, herding breeds — sensitive to ivermectin, moxidectin, selamectin)
• Puppies, seniors, debilitated

Veterinary Treatment

• Decontamination, supportive care (fluids, antiemetics, anticonvulsants)
• Benzodiazepines for tremors/seizures
• Lipid emulsion therapy (severe macrocyclic lactone toxicity)

Prevention

• Read label: species, weight, age.
• Use vet-recommended products.
• Separate pets until dry (topicals).
• Report adverse events to manufacturer and FDA/EPA.