The 8 Best Flea Collars for Dogs in 2021

Protect your pooch from these tiny pests

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Our Top Picks
"This collar is waterproof, hypoallergenic, provides eight months of protection and can fit dogs of almost any size."
"Budget-friendly, this collar is fast-acting and water-resistant and fits dogs with a neck size up to 26 inches."
"Non-greasy and odorless, this collar is ideal for dogs weighing up to 18 pounds."
"This collar is fast acting against fleas and ticks and is also water resistant."
"Puppies as young as six weeks with neck sizes up to 15 inches can wear this water resistant, effective collar."
"This collar will help you find your dog outside at night while protecting them from fleas and ticks."
"All-natural, this dog collar tag can simply be attached to your pet’s regular collar and also helps against pesky mosquitoes."
"This collar is for dogs weighing more than 18 pounds and starts working within two hours of being placed on your dog’s neck."

Fleas feast on your pet’s blood, which can cause infection or hair loss. Along with causing health problems, it’s uncomfortable for your dog to have fleas—not to mention that fleas can also bite humans (although pets are their preferred host). Since fleas reproduce rapidly, preventing a flea infestation is your best bet. Flea collars can help, by repelling or killing pests. Since flea collars contain toxic substances, it’s wise to check with your vet to determine which collar (if any) is recommended for your pet.

Here, our favorite flea collars for dogs.

Best Overall: SOBAKEN Flea and Tick Prevention for Dogs

Sobaken Flea and Tick Collar

When you purchase this flea and tick collar from Sobaken for your dog, you’ll be doing something nice for your pooch—and helping support animal-focused charities, since Sobaken donates $3 with each collar that’s sold. 

The collar offers eight months of protection and is waterproof (that’s even better than being water-resistant), so you won’t have to replace the collar if your pooch goes for a swim

Sobaken’s collar is hypoallergenic and can be used once your pet is three months (or 12 weeks) old. The active ingredients are continuously released from the collar to spread throughout your dog’s body. 

This collar is appropriate for pretty much any size dog—after you’ve placed the collar around your dog’s neck, simply cut off any excess length. (Remember to leave a few extra inches of give in the band for your dog’s comfort.)

Best Budget: Adams Flea and Tick Collar For Dogs

Adams Flea & Tick Collar

This budget-friendly flea and tick collar from Adams offers seven months of protection from these pesky critters. It both treats and prevents, using two active ingredients: tetrachlorvinphos and (S)-Methoprene. After these ingredients get on your dog’s fur, they’ll move throughout the body thanks to the naturally occurring oils on your dog’s body. 

As well as being fast-acting, this collar is also water-resistant. The collar fits both small and large dogs, with a neck size of up to 26 inches. (You can simply cut off any excess collar band that’s left after you place this around your dog’s neck.)

Best for Small Dogs: Seresto 8 Month Flea & Tick Prevention Collar for Small Dogs


This collar repels and kills both fleas and ticks. It’s both non-greasy and odorless—those are too very desirable qualities in a flea collar, since many have a pronounced (and unpleasant) odor and make your dog’s skin have a greasy texture. 

The collar uses two active ingredients, imidacloprid and flumethrin, and offers eight months of protection against fleas and ticks. This adjustable, water-resistant collar from Seresto is fast-acting and will begin to repel and kill fleas within a day of when you put it on your dog. 

While this option is ideal for small dogs that weigh up to 18 pounds, there’s a larger collar (see elsewhere on this list) that’s ideal for bigger pooches.

Best Fast Acting: SALVO Flea and Tick Collar for Dogs

Salvo Flea and Tick Collar

This flea collar provides action against fleas and ticks—fast. Your order comes with two collars, which will offer up to a year of protection. The water-resistant collar can be adjusted to fit your dog’s neck size. 

The medication takes advantage of the natural oils on your dog’s skin, which the manufacturer notes will limit the messy application process of flea medications. The smell of the medication isn’t unpleasant, and note that it’s manufactured to meet guidelines from the Environmental Protection Agency.

Best for Puppies: Hartz UltraGuard Plus Flea and Tick Puppy Collar

Hartz Ultra Guard Plus

You can use this Hartz collar on puppies as young as six weeks. It’ll fit on neck sizes up to 15 inches, and once on, it’ll last for seven months. Plus, the collar is water-resistant (so you don’t need to remove it during rainy walks or if your puppy goes swimming)—it will continue to work properly even after getting wet. 

Once you place this collar on your puppy, it will kill fleas and flea eggs immediately. It may take a few days to become completely effective at killing ticks. This is an effective flea collar, from a trusted brand. 

Best Reflective: Hartz UltraGuard Plus Reflecting Flea & Tick Collar for Large Dogs

Hartz Reflecting Flea & Tick Collar

A reflective collar will help your dog stay visible even when it’s dark outside. This option from Hartz also offers seven months of protection from fleas and ticks, both killing and repelling them, while also preventing the flea eggs from hatching. This flea collar is intended for puppies who are older than 12 weeks and is ideal for medium- and large-sized dogs. The collar will fit a neck size of up to 22 inches.

Best Collar Tag: Only Natural Pet Easy Defense Flea & Tick Tag for Dogs and Cats


Use this collar tag to help prevent fleas and ticks, as well as mosquitos, from pestering your pooch. This all-natural option uses silicon dioxide particles to program frequencies that are irritating to pests (but won’t bother your dog). That means this collar is free from chemicals. 

And using this tag is simple: You’ll just attach it to your pet’s collar positioning it furthest from your pet. Note that it’ll take days or up to a week before the collar to become effective.

Best for Large Dogs: Seresto 8 Month Flea & Tick Prevention Collar for Large Dogs


We like the Seresto 8 month flea and tick collar for small dogs, and it’s our pick for large dogs as well. This flea collar will kill the fleas on contact—no biting—and will not leave a greasy slick behind. 

This collar is intended for dogs who weigh more than 18 pounds and will begin working within 2 hours of first being placed around your dog’s neck. As with the small collar, it’s water-resistant and will last up to eight months.

Why Trust The Spruce

Madeleine Burry is a dog lover who has written content about pet health and conditions for PetCareRx, AAA’s Via Magazine, and Women’s Health.

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