Can Flea Medicine Make a Dog Sick and the Importance of Medication Safety

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Posted Oct 25, 2024

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Flea medicine can be a lifesaver for dogs, but it's not without risks. In fact, some flea medications have been linked to serious health issues in dogs.

Using flea medicine without consulting a veterinarian can be particularly problematic. This is because some flea medications can interact with other medications your dog is taking.

Flea medicine can cause vomiting, diarrhea, and even seizures in some dogs. These symptoms can be caused by the active ingredients in the medication, such as fipronil or imidacloprid.

It's essential to follow the instructions on the flea medication label carefully. This includes administering the correct dosage and not using the medication more frequently than recommended.

What to Know

Isoxazoline products, commonly used to prevent flea and tick infestations, have been associated with neurologic adverse reactions in some dogs and cats. These reactions can include muscle tremors, ataxia, and seizures.

The FDA considers these products safe and effective, but it's essential to be aware of the potential risks. Although most pets don't experience these adverse reactions, seizures can occur in animals without a prior history.

Credit: youtube.com, Local dog owner says flea medicine made his pet sick

If your dog or cat experiences any adverse event while using an isoxazoline product, consult your veterinarian first. They can provide guidance and help determine the best course of action.

The FDA encourages pet owners and veterinarians to report adverse drug events. You can report directly to the FDA or contact the manufacturer, who is required to report the information to the FDA.

Here are some phone numbers to contact the manufacturers for technical assistance and to report suspected adverse drug events:

  • For technical assistance and to report suspected adverse drug events, contact the manufacturers at the following phone numbers:
  • These phone numbers are not provided in the article section, but you can find them by contacting the FDA directly.

Symptoms and Causes

If you suspect your dog has ingested flea or tick medicine, it's essential to know the symptoms to look out for. These can develop within 15 minutes to several hours after ingestion or application, and they're often severe.

Symptoms can include intense itchiness, restlessness, and vocalization, such as crying or whimpering. You may also notice redness, hair loss, and scarring at the site of application.

Some common signs of flea and tick medicine poisoning in dogs include drooling, vomiting, and a lack of appetite. Your dog may also exhibit gagging or hacking, agitation, and muscle tremors.

For another approach, see: Dog Flea Symptoms

Credit: youtube.com, Dog nearly dies after flea treatment

In severe cases, symptoms can progress to difficulty standing or walking, weakness, and seizures. Unfortunately, in extreme cases, flea and tick medicine poisoning can even lead to death.

Here are some common causes of flea and tick medicine poisoning in dogs:

  • Unintentional misuse of flea and tick prevention
  • Accidental ingestion or absorption of insecticides
  • Using expired medications
  • Cutting larger sizes of medication into smaller pieces or giving multiple smaller doses
  • Giving medication intended for cats to your dog, or vice versa

Remember, it's always better to err on the side of caution and consult with your veterinarian if you have any concerns about flea and tick medicine poisoning in your dog.

Veterinarians Diagnose

A veterinarian will make a presumptive diagnosis if there is a known or possible history of exposure to a product containing a pyrethrin or pyrethroid, or ingestion of flea/tick medicine.

Blood work and urine testing may help rule out other possible causes.

In a presumptive diagnosis, a veterinarian has a good reason to believe that something is causing the problem but can't prove it with a specific diagnostic test.

After a complete physical examination, your veterinarian will consider all the information to determine the best course of action for your dog's health.

Treatment and Recovery

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Treatment for flea and tick medicine poisoning in dogs depends on the severity of the toxicity and symptoms. Your veterinarian might recommend hospitalization for supportive care.

If your dog has ingested the toxic substance, quick removal is crucial. Bathing your dog with a liquid dish soap like Dawn, Joy, or Palmolive can help get the greasy substance off, and rinsing the mouth with copious amounts of water is essential.

Supportive care might include repeat bathing, intravenous fluids, anti-nausea medications, muscle relaxation, and seizure medication. Your veterinarian will also monitor your dog's temperature, blood sugar levels, and kidney function.

Most mild to severe symptoms resolve within a few days, but adverse reactions can occur. Excessive drooling, paw flicking/scratching, and ear twitching are often mild and can go away on their own.

Treatment

Treatment for flea and tick medicine poisoning in dogs requires immediate attention. The goal is to remove the toxic substance from the dog's system as quickly as possible.

A Veterinarian Sitting Beside a Black Dog Lying on the Table
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Your veterinarian may recommend a simple treatment, such as bathing your dog with a liquid dish soap like Dawn, Joy, or Palmolive to get the greasy substance off. This is usually done on an outpatient basis.

In severe cases, hospitalization may be necessary to provide supportive care. This can include repeat bathing, intravenous fluids, anti-nausea medications, muscle relaxation, and seizure medication.

Supportive care is crucial in managing the symptoms and preventing further complications. Your veterinarian may also want to monitor your dog's temperature, blood sugar levels, and kidney function.

Here are the common supportive care treatments:

  • Repeat bathing
  • Intravenous (IV) fluids
  • Anti-nausea medications
  • Muscle relaxation
  • Seizure medication

Recovery and Management

Prompt recognition and early treatment can greatly improve the prognosis for your dog.

If your dog develops severe symptoms such as neurologic signs, kidney issues, seizures, and elevated body temperature, the prognosis is generally poor.

Adverse reactions like excessive drooling, paw flicking/scratching, and ear twitching are often mild and can resolve on their own.

Drooling may recur for several days after using a flea-control product, but most symptoms will resolve within a few days.

Overdose Treatment

Man in Blue Scrub Suit Checking Up a Dog
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If your dog has ingested flea or tick medicine, treatment is crucial to prevent further harm. Treatment may be done on an outpatient basis or require hospitalization for supportive care.

There is no antidote for flea and tick medicine poisoning, so quick removal of the product is essential. This can be done by bathing your dog with a liquid dish soap like Dawn, Joy, or Palmolive to get the greasy substance off.

Use a garden hose to help flush the mouth with copious amounts of water if your dog has ingested the toxins. Repeating the bathing process may be necessary to remove all the toxins.

Supportive care may include intravenous (IV) fluids, anti-nausea medications, muscle relaxation, and seizure medication. Your veterinarian may also want to monitor your dog's temperature, blood sugar levels, and kidney function.

In cases where neurologic signs occur, hospitalization is necessary to minimize the extent and severity of them. This may require several days of care.

Here are some common supportive care treatments:

  • Repeat bathing
  • Intravenous (IV) fluids
  • Anti-nausea medications
  • Muscle relaxation
  • Seizure medication

Prevention and Safety

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To prevent accidental exposure to flea and tick medicine, follow all directions carefully, as the dosage is based on your dog's body weight.

Ensure your dog only receives his prescribed medication, and don't give more than one drug at a time to avoid an accidental overdose.

Using part of a larger dose or multiple smaller doses can also lead to an overdose and increased chance of poisoning.

If you're unsure about the dosage, bring your dog to the veterinarian for proper guidance.

Overdose Risks

Flea medicine can be a lifesaver for dogs, but it's not without its risks. If you apply a flea treatment as recommended, you shouldn't have any problems.

However, if the medication is applied excessively, or if a dog is exposed to it in some other product, the toxins can affect the dog's nervous system and cause a range of problems. This can result in repetitive nerve discharges, or twitches and tremors, in affected dogs.

Credit: youtube.com, [Warning] Flea and Tick Product Side Effects

Some common signs of a mild overdose of flea medication include twitching, excessive salivation, paw flicking, vomiting and diarrhea, and depression. If the overdose is of a greater magnitude, the symptoms can be much more worrying.

Vomiting and diarrhea can be ongoing, and your dog may be unable to control their muscles. A lack of coordination is another common sign, along with confusion, excessive drooling, moving in circles, seizures, and even collapse. In some severe cases, death may result.

Symptoms may take up to 12 hours to appear after the flea treatment has been applied. Dogs that have abnormally low body temperatures, for example after bathing or sedation, are predisposed to showing the signs and symptoms of toxic poisoning.

Here are some signs of a flea medicine overdose to watch out for:

  • Panting
  • Weakness
  • Drooling
  • Dropped Ears
  • Muscle Twitches And Tremors
  • Excessive Drooling
  • Vomiting And Diarrhea
  • Depression
  • Lack Of Co-Ordination
  • Confusion
  • Seizures
  • Collapse

If you think your dog is having a severe reaction to a flea medication containing pyrethrin or pyrethroid, take them to a veterinarian immediately.

Frequently Asked Questions

Why do dogs act weird after flea medicine?

Dogs may act weird after flea medicine due to the death of fleas causing itchiness and discomfort, or irritation from the treatment itself. This can lead to restlessness and other unusual behaviors in affected dogs

Does flea and tick medicine make dogs throw up?

Yes, flea and tick medicine can cause vomiting in dogs, but it's a potential risk that can be minimized with proper use and under the guidance of a veterinarian.

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Edmond Gibson

Lead Writer

Edmond Gibson is a seasoned writer with a passion for crafting informative and engaging content. With a keen interest in the human-animal bond, Edmond has honed his expertise in writing about pets and their well-being. His articles have appeared in various online publications, covering topics such as dog ear surgery and other veterinary-related issues.