What Are the Dangers of Frontline Plus for Your Pet Dog?

Written by melanie fleury
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Frontline is an over-the-counter flea and tick control medication for dogs. Applied once a month on the skin between the shoulder blades, it spreads through the hair or fur to the rest of the body. While it is effective in flea and tick control, it is still a chemical that has side effects to keep in mind.

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Side effects of fipronil

One active ingredient in Frontline is fipronil. Fipronil has been shown to cause thyroid cancer and damage to nervous and reproductive systems. Fipronil can also cause chemical burns, and some dogs can have had hair loss where the Frontline was applied.

Effects of insecticide

Frontline kills flea and ticks, so it is labelled as a pesticide or insecticide. Insecticides have been shown to cause harm to humans and animals. Insecticides can cause inflammation and burning on contact, especially if it gets in the eyes.

Side effects of Methoprene

Methoprene, another ingredient in Frontline, is a neurotoxin. It can cause liver enlargement, headaches, throat irritation and nausea in large quantities. It has also been shown to cause difficulty in breathing and dizziness in some.

Side effects of ethanol

Ethanol is also present in Frontline. Ethanol can cause fatigue, lethargy, dizziness and nervous system disruption. It is harmful if swallowed, so notify a veterinarian right away if your dog ingests the Frontline medication.

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