Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Can a Flea Collar Make a Cat Sick? Vet-Reviewed Risks & Considerations

kitten wearing green flea collar

Flea collars can seem quite convenient, but many of them do not work well. For one thing, some do not have proven ingredients that will keep fleas away, so the results may vary. There are also safety concerns.

Flea collars are technically a type of medication, and just like any medication, they can make a cat sick. This typically occurs when a cat is given a flea collar intended for dogs or has a negative reaction to the insecticide used in the collar. Felines can be affected by the insecticide even if they responded fine to it before. Environmental factors and continuous exposure can irritate felines that weren’t previously sensitive and lead to skin reactions, such as a rash.

Furthermore, many flea collars contain strong pesticides that can be harmful to the cats using them. Therefore, many vets do not recommend flea collars.

divider single cat paw oct 2024

Potential Reactions to Flea Collars

Flea collars work by emitting chemicals that keep fleas away. Some chemicals are released as a toxic gas, which is emitted near your pet’s face. Others work by spreading chemicals through your cat’s skin, which can result in irritation. Therefore, while flea collars can be effective, they are not usually the safest option for your feline.

Reactions can also vary. For instance, skin irritation can occur with any collar and is a result of the collar rubbing on the skin. Making sure your cat’s collar fits properly can help ensure it doesn’t move too much.

However, collars can also cause chemical burns on your pets. Since different kinds of cat flea collars release different active substances, possibly including organophosphates, other potential side effects include seizures and serious neurological signs. Sometimes, these side effects can even be deadly. Some cats may react fine to the chemicals in the collar, while others may react very negatively. A quick look at any major review website will show you countless negative reviews that involve serious side effects.

Many vets do not recommend flea collars because they may cause side effects like these. While treatment can help many cats, the signs of neurological toxicity damage may hang around even after discontinued use.

Collar for animals protecting against fleas
Image Credit: Gagarin Iurii, Shutterstock

divider single cat paw oct 2024

Alternatives to Flea Collars

We recommend using an alternative to a flea collar. It’s still important to protect your cat from fleas, so don’t let flea collars prevent you from using any form of protection. Instead, we recommend using one of these alternative methods.

Topical Applicators

Out of all the options out there, we recommend topical applicators first and foremost. These are often easy to apply and effective. You do have to reapply them on a schedule, but many products only need to be applied once a month. Most are waterproof, so you don’t have to worry about your cat getting wet.

Of course, not all topical applicators are effective. Most have an adulticide ingredient, which kills adult fleas. This usually remains effective between doses, preventing fleas the whole time. Others include insect growth regulators, which prevent larval fleas from maturing. Those with this ingredient are most effective, as they help to break the flea cycle. Some of these products also protect your cat against ticks, mites, and intestinal parasites.

Oral Medication

There are many anti-parasite medications out there that kill fleas when they bite your feline. While this does mean your feline has to be bitten, they are more effective than most other options out there.

Of course, medication can be a bit more difficult to give to your feline. Many owners find that wrapping the pill in cheese or hiding it in meat is effective. It depends mostly on your cat. Some felines are so picky that they will catch on to the charade and refuse to eat these special treats. Others will eat the treat and spit out the pill, so be sure to watch your cat while they are eating it.

Some of these medications need to be readministered monthly, while others can be given more regularly. It depends on the product, so it’s best to only give your cat something prescribed by your vet and to follow their instructions.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

Flea Treatments for the Home

When cats get fleas, the parasites will also be elsewhere in the house. So, when dealing with a flea infestation in your cat, you will need to take care of the flea eggs, larvae, and pupae scattered around your home too.

There are several steps involved, including washing all the bedding, vacuuming, steam cleaning, and if needed, applying non-toxic sprays.

Be sure to vacuum and steam everywhere. Lift rugs, and get your cat’s bedding, as this is where most fleas will live. Remove the cushions and clean underneath the bed. Pillows and blankets can be washed in a washing machine on the hot water setting to kill fleas and eggs (assuming that it is safe for them to be washed).

After vacuuming, consider spraying the inside of your vacuum bag with an anti-parasite spray, as eggs and larvae can develop inside it. If you choose not to use chemicals, just be sure to seal the bag properly before disposal.

Anti-flea sprays usually fall into a few different categories:
  • Adulticide treatments that only kill adult fleas
  • Professional treatments applied by a pest control company
  • IGR sprays that prevent fleas from maturing

Since many chemicals in such sprays can be toxic to cats and even humans, precautions must be taken when choosing the product to ensure safety. Keep the cat away from treated areas during application and don’t allow them back for a while afterward.

For most flea treatments, an adulticide and IGR spray are helpful. Adulticide-only sprays can be used, but you’ll have to reapply them regularly to keep killing adult fleas. There is always a chance that the fleas will reproduce before you spray them, and then their eggs will hatch and mature. Therefore, these usually require more than one application. IGR sprays often only need to be used once, as they prevent fleas from maturing. Applying an adulticide might be necessary if you want to kill the fleas that have already matured.

Read All Labels Carefully

Cats are often more sensitive to chemicals than dogs. Therefore, they tend to react negatively to chemicals that canines might be fine with. Flea-prevention products labeled for dogs may not be safe for felines, so check the label on all products, and ensure that it is made for cats and not dogs.

Products labeled for both animals are typically safe, as these should include cat-safe ingredients that are usually safe for dogs too. When in doubt, ask your veterinarian.

divider single cat paw oct 2024

Conclusion

While we recommend that all cats be given a flea-prevention treatment, flea collars are probably not the best options, as they are typically not that effective. Furthermore, they may intoxicate your cat and cause side effects, including seizures, and they are often not recommended by many vets.

Instead, a topical or oral option should be considered. Both of these are pretty easy to apply and can be effective. Of course, different treatment options have different effectiveness and safety, so be sure to research any product and get it approved by your vet before purchasing it.


Featured Image Credit: Fayzulin Serg, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.


How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

The Dark Side of Cat Cloning: Cost, Process, Ethics & More

In the almost three decades since the creation of Dolly, the world’s first cloned sheep, the technology of cloning has been tweaked and...

York Chocolate Cat Breed: Info, Pictures, Temperament & More

The York Chocolate is a relatively new breed, having been established in the 1980s when a black and white farm cat mated with...

Cat Litter Box Tips: 9 Vet-Approved Ideas For Placement, Cleaning & More

Cats are notorious for being particular about their litter boxes. Most have specific ideas about where their facilities should be located, what type...

Can Cats Drink Lactaid? Vet-Approved Nutritional Science & Info

Lactaid is a lactose-free milk product, free from the sugar lactose found in milk. It is intended as milk suitable for those who...

More related

16 Vet-Verified Tips for Moving House With a Cat

Moving to a new house can be a hugely daunting undertaking. It is usually associated with several other big life changes, such as...

Are Ragdoll Cats Vocal? 5 Vet-Verified Sounds (With Audio)

One of the most endearing things about cats is that they’re such a mixed bag personality-wise. Some are real snuggle bugs, whereas others...

Pet Care Insurance Review 2026: Pros, Cons & Verdict

As a pet professional, you know the importance of protecting your business and your clients. You also know how unpredictable four-legged companions can...

How Does Dust-Free Cat Litter Work? Types, Pros, Cons & FAQ (Vet-Reviewed)

As a cat parent, you know the importance of finding high-quality, absorbent cat litter. However, not only do you have to be happy...

Keep reading

Why Is My Cat Missing the Litter Box? 11 Vet Reviewed Reasons & Advice

If your feline is missing the litter box, it can quickly become very annoying. You’ll have to clean around the litter box as well as clean out the litter box. It may even seem like your cat is missing the...

maine coone in litter box

Cat Airplane Ears: 4 Vet-Verified Reasons Why Cats Do This, Facts & FAQ

Cats are known for their quirky behaviors, but one that continues to baffle pet owners is when they have “airplane ears.” This seemingly strange behavior does have a purpose, and it’s not necessarily a good thing when your cat has...

Cat laying on the grass with airplane ears

Do Devon Rex Cats Shed a Lot? Vet-Verified Tips to Reduce Cat Hair & FAQ

The Devon Rex cat, with its pixie-like appearance and charming personality, is an increasingly popular breed of feline. While these cats are known for their curly hair, endearing nature, and playful antics, one of the most common questions prospective owners...

woman brushing calico tortoiseshell Devon Rex

How to Brush Your Cat’s Teeth: 7 Vet-Approved Steps With Video

Dental disease is incredibly common in domestic cats, with experts estimating that between 50%–90% of cats over the age of 4 years old have some kind of dental disease. The good news is that most of these diseases are preventable...

Vet Cat Toothbrush

Is Christmas Cactus Poisonous to Cats? Vet-Reviewed Houseplants Examined

The unfortunate truth of living with cats is that you’ve signed up to live with a pet that will get into everything—plants included. If you have a Christmas cactus in your home, you might wonder if this plant is poisonous...

Catster_Is Christmas Cactus Poisonous to Cats

Can Cats Eat Fennel? Vet-Reviewed Facts & FAQ

Cats are obligate carnivores and require a diet of meat from animal sources. Once in a while, cat owners might wonder if the occasional fruit or vegetable is safe for cats to eat. Usually, some plants can provide fiber and...

Can Cats Eat Fennel

Why Do Cats Walk in Circles Before Lying Down? Vet-Verified Facts & FAQ

Cats are known for their weird yet fascinating behavior, which can sometimes leave owners shaking their heads. One of the most peculiar behaviors that many cat owners have observed is their tendency to walk in circles for a minute or...

russian blue lying down

Can Cats Eat Mayo? Vet-Reviewed Nutrition Facts & Advice

Mayo is a condiment that can be found in many people’s pantries and refrigerators. But what about cats? Can cats have mayonnaise? While it may add some flavor to food, it’s not a good idea to add mayo to your...

Can Cats Eat Mayo