About Fleas on Dogs and Flea Control

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Fast Flea Control for Your Dog

Flea control is a vital part of caring for the dog you love so much, not to mention helping to prevent infestations in your home from these tiny blood-sucking pests.

Spinosad, one of the active ingredients of Trifexis® (spinosad + milbemycin oxime), protects your dog against fleas and starts killing fleas fast. It started killing fleas within 30 minutes and was proven 100% effective within 4 hours after administration in a controlled laboratory study.

Trifexis is flea medicine for dogs that:

  • Lasts a full month
  • Kills fleas before they can lay eggs
  • Can't be rubbed, washed or shaken off

Trifexis protects your dog from more than just fleas. It also protects against heartworm disease and intestinal parasites (adult hookworm*, roundworm and whipworm infections). Trifexis is approved for use in dogs and puppies 8 weeks of age and older and 5 pounds or greater. 

*A. caninum

See the 3-in-1 power of Trifexis

Why worry about fleas on dogs? 

Adult fleas are tiny, reddish-brown insects that can make your dog itchy and miserable. They’re visible to the naked eye but are so tiny you might not even see them. It makes fleas difficult to detect, much less eliminate from your home.

Fleas have incredible jumping ability, which enables them to easily leap onto your dog from ground level and begin feeding on your dog’s blood in just seconds. Within 24 hours of its first blood meal, a flea can begin laying eggs, which can quickly lead to an infestation.1 If you see little specks of “flea dirt” on your dog’s skin—the undigested blood excreted by fleas—you’ve likely got an infestation.

Fleas can pose a serious problem for your dog’s health.

  • Fleas can cause severe discomfort for dogs, including scratching, chewing, biting and restlessness.
  • Severe flea infestations can cause anemia, especially in puppies or debilitated adult dogs.
  • Ingested fleas can also transmit tapeworm infection to dogs.

Dog Fleas can also pose health risks for your family.1

Your dog isn't the only household resident that can suffer from flea bites. Flea infestations can lead to you and your family experiencing bites from newly emerging fleas, which can put you and your family at risk for health issues.

fleas life cycle2

Understanding the lifecycle of a flea (Ctenocephalides felis) helps you protect your dog and your home from fleas. It shows you why it's critical to kill fleas quickly, before they can lay eggs and create a flea infestation in your home.

Fleas Life Cycle

Fleas Sizes

Controlling fleas in your home

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Even if your dog never leaves your house, she can be exposed to these blood-sucking parasites. That’s why preventing flea infestations before they disrupt your life is your best defense. 

Trifexis starts killing fleas on your dog before they can lay eggs. Trifexis lasts a whole month—it can’t be rubbed, washed or shaken off. It helps you protect the dog you love from enduring the discomfort of a flea infestation.

If you have more questions about fleas or Trifexis, you may find the answer on our frequently asked questions page.

See our FAQ page