My Dog’s Flea Collar Is Not Working [Explanation]

Flea collars are pet collars that have been treated with chemicals to protect dogs from the painful bites of fleas and to aid in efficiently eradicating these pests from the pet bodies. But sometimes, flea collars do not work effectively.

my dogs flea collar isn't working

Let’s discuss why flea collars not working on dogs properly and how to choose the best quality flea collars.

5 Reasons Why Flea Collar Not Working

Here are the top 5 reasons that lead to the inefficient working of flea collars:

  1. Dog Scratching It: It is essential that you are aware that the flea collar is only effective while your pet is wearing it. Upon removal, there will be an abrupt halt to the action. Therefore, you should ensure the flea collar is on at all times, including when your pup is swimming or taking a bath.
  2. It Might Have Affected By The Flea: It is possible that your dog is already affected by the fleas severely. In that case, flea collars may take some time to work or did not work at the very start (due to the huge flea population)
  3. Irregular Bath: Most flea collars are waterproof and work even if your dog gets wet, so you don’t have to take it off when it swims or takes a bath. However, it can only get wet so often. After some period of time, it will either stop functioning altogether or become less efficient. It is recommended that you do not give your dog more than two baths each month and that you only do it when they are wearing their collar. Swimming is not at all recommended at this time. Once the active ingredients have been relatively distributed across your pet’s coat, shampooing significantly shortens the 32 weeks of the effectiveness of the flea collar. 
  4. Thick Fur: It may be challenging for the flea collar to operate well with the thick coat since it isn’t able to penetrate it entirely.
  5. Chemical Doesn’t Suit Them: It is possible that the chemicals used in flea collar is allergic and not suitable for your pup’s skin. So, try to change the flea collar with different active ingredients.
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How to Choose the Right Flea Collar for Your Dog

When deciding which flea collar is the most suitable for your pup, you need to take into account the product’s efficacy, durability, and safety. Any premium quality flea collar for dogs must successfully eliminate adult fleas for up to 32 weeks.

The most effective flea collar is one that can eliminate flea adults, eggs, and flea larvae. The vast majority of flea collars are also water resistant, meaning they can be wet for short periods and should not be removed before bathing or swimming.

Qualities of Best Flea Collar

Here are some of the characteristics of the best quality flea collar:

  • Cost-effectiveness
  • Automatic protection via rescheduling
  • Easy to use
  • Repels other parasites along with fleas, such as mosquitos and ticks
  • Resistance to water‍

Best Flea Collar Dogs (Top Choices)

PETARMOR Plus Flea and Tick Collar for Dogs

PetAmor Plus is a topical treatment for fleas and ticks that is powerful and kills eggs, larvae, and adult fleas for up to 28-30 days. This collar is waterproof. Additionally, this collar is of veterinary quality. It contains the active component fipronil, which is widely recognized as a potent medication that begins killing fleas in the treated area 24 hours after it has been applied. To figure out how much of the product you should purchase, you need to weigh your pet and use that number as the basis for your decision.


  • This collar is highly effective, and waterproof.
  • Up to 3 months’ worth of protection against flea eggs and larvae. 
  • In contrast to common flea collars, this collar has a different active component (Fipronil) which is of very potent vet quality.
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  • Not effective in the long run.

Frontline Plus Flea and Tick Treatment

Frontline is a waterproof flea treatment collar that works quickly and is an excellent therapy for dogs and other animals. It is likely the most popular flea treatment available. It is effective for an extended period of time, destroys eggs and larvae, puts an end to infestations, and inhibits new infestations from growing. Frontline Plus for Dogs has also become one of the most well-known brand names in the industry of flea treatments for pets.


  • The frontline flea collar is one of the most well-known brand names available for the treatment of fleas and ticks.
  • It is water resistant and kills fleas on touch immediately.
  • Veterinarian approved.


  • A little bit costly.


Question: Why Does My Dog Still Have Fleas With a Flea Collar?

Answer: This may be due to many reasons, including the following:

  • Your dog is scratching the flea collar
  • Your pup is taking frequent or irregular baths
  • Your dog has thick fur
  • Flea collar chemical does not suit your dog.

Question: How Long Does It Take for Flea Collars to Work?

Answer: In most cases, chemical flea collars begin to work within the first 24 hours, but it often takes approximately three to four weeks for the full effects of the treatment to become apparent.

Question: Do you leave a flea collar on all the time? 

Answer: For the flea control collar to be successful, it must be worn consistently by your pet for a period of at least 32 weeks. Because it is equipped with several safety measures, the collar can provide you with the peace of mind to let your dog continue leading their usual, active lifestyle.

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If you choose to use flea collars on your dog, your pup will most likely benefit from wearing one. Flea collars often continue to be effective for several months, providing dogs with continuous protection against fleas.