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Liberty 50 Plus IGR Flea Spot On for Dogs Review

Liberty 50 Plus IGR Flea Spot On for Dogs Review


Finding the perfect product to kill fleas, ticks and other biting insects on your dog can be tough, but the last thing that you want is an infestation.

On the other hand, you don’t want to waste your money or buy a product that can harm your dog or your other pets, either.

We’re looking out for you though. Throughout the following paragraphs, you’ll learn all about Liberty 50 IGR Spot On, including what’s in it, how it supposedly works, and whether it really does work.

You’ll know if this product really protects your pet and your home like it claims or whether you should just skip on to the next one!

Company Claims

According to Star Horse, the manufacturer, Liberty 50 IGR Spot On kills five different types of pests on dogs:
  • Fleas
  • Ticks
  • Mosquitoes
  • Lice
  • Mites
  • It also supposedly breaks the flea lifecycle by destroying:

  • Flea eggs
  • Flea Larvae

The treatments come in a 6-month supply packaged separately for small, medium, large and extra-large dogs.

Active Ingredients

  • Permethrin 50%
  • Pyriproxyfen 1.2%

How it Works

Permethrin is an insecticide that acts as a neurotoxin to the insect. Though declared safe for adult dogs, it’s highly toxic to cats and may affect puppies and smaller dogs, too.

Pyriproxyfan is a growth inhibitor (thus the “IGR” in the product name) that keeps larvae and eggs from developing, thus breaking the lifecycle of the insect.

What Are Users Saying?

Reviews on this product aren’t great. It seems that people who have indoor dogs without fleas like this but if your dogs are outside frequently or already have fleas, this probably isn’t going to work for you.

There are also toxicity concerns about Permethrin. It’s toxic to cats and some dog owners have reported neurological conditions up to and including death in smaller or sensitive dogs.

The price is extremely competitive at $5 or less per dose.

Usage Information

Apply between the shoulder blades and allow to dry. Reapply every 4 weeks.

Product Warnings and Side Effects

Do not use on cats because the active ingredients may cause neurological damage up to and including death. Permethrin is highly toxic to felines and may cause seizures, lethargy, confusion and unsteadiness in small or sensitive dogs.


Because of the toxicity issues and lack of efficacy, we don’t recommend Liberty 50 Spot On if you have cats or want to kill fleas on dogs. If you’d like to see our suggestions for safe, effective flea drops, click here.

If you’ve used Liberty 50 IGR Spot On, please let us know how it worked for you in the comments section below.

3 Responses to “Liberty 50 Plus IGR Flea Spot On for Dogs Review”
  1. Tammy Gage says:

    Why is there no instructions on frequency of the application?

  2. Tammy Gage says:

    Ooops. I found it, never mind thx

  3. Anonymous says:

    I run a kennel it works damn good. permethrin and pyrethrin is what use to be in frontline and all the other expensive flea control. but the 20 year patent expired so they had to come up with something else so they could charge the crazy prices again. So now you can buy it cheap and it works great. It is the only stuff I use and like I said I run a kennel.

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