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Hartz Ultraguard Flea and Tick Collar for Cats Review 2024: FAQ, Pros, Cons, and Verdict

Sarah Psaradelis

By Sarah Psaradelis

Hartz Ultraguard Flea and Tick Collar

Review Summary

Our Final Verdict
We give Hartz Ultraguard Flea and Tick Collar a rating of 4.4 out of 5 stars.
Quality: 4.6/5
Features: 4/5
Price: 4.5/5
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Hartz is a well-known brand that sells pet care supplies and has been around since 1926. They have manufactured plenty of high-quality items that you can use for your pet. One of their most impressive products is their tick and flea collar for cats, mainly because it claims to last much longer than other leading brands. This flea and tick collar from Hartz is available in different colors and one size fits all cats, from kittens and cats over 12 weeks of age.

Made from high-quality materials, this collar has an affordable price with high-quality features that make it a great method to keep pests like fleas and ticks away from your cat. The collar uses a modern method of chemical insect-repelling ingredients that help keep your cat safe from head to claw.

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Hartz Ultraguard Flea and Tick Collar – A Quick Look

  • Kills and repels fleas and ticks for up to 7 months
  • Water-resistant
  • Includes a breakaway safety feature
  • Has a fresh scent
  • Affordable for the high-quality design
  • Does not have an unpleasant odor
  • There have been reports of cats having chemical burns from the collar
  • Only suitable for cats and kittens over 12 weeks of age
  • Contains a chemical known to the State of California to cause cancer according to Hartz manufacturers


Brand: Hartz
Size: One size fits all
Color: White, purple
Maximum usage: 7-14 months
Age range: Kittens and cats over 12 weeks old
Scent: Fresh
Product weight: 3 pounds
Main active ingredients: Tetrachlorvinphos and S-Methoprene

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Prevents Ticks and Fleas in Cats

Hartz Ultraguard Flea and Tick Collar

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This Hartz Ultraguard flea and tick collar for cats contains two active ingredients (tetrachlorvinphos and S-Methoprene) to protect against fleas. It is a plastic collar that has an adjustable size to fit both cats and kittens over 12 weeks of age, is filled with insecticides, and can be worn with your cats’ regular collar.

This collar has a long usage unlike many other fleas and tick collars, as Hartz claims that the collar can last for up to 7 months. It works when the chemicals come into contact with fleas and ticks, as it does not have to bite your cat to kill them.

Aside from killing fleas and ticks, the collar also helps prevent other insect larvae, lice and flies from infesting your cat.

Safety Feature

The Hartz Ultraguard flea and tick color have a safety feature that allows you to easily break the collar in an emergency. This is also an excellent safety feature to have in place for cats who wander outdoors a lot, as it can easily be broken off if they were to get stuck to prevent an injury.

Hartz also recommends making sure that the collar is not too tight against your cat’s neck and that there is space for two fingers to fit between your cat’s neck and the collar. It is also not recommended for sick, medicated, or young kittens over 12 weeks of age to wear this collar.

Water Resistant

Hartz has created a water-resistant collar that can be worn for outdoor cats who venture out in the rain. The water droplets will not be enough to reduce the collar’s efficiency or prevent it from working. However, soaking the collar in the water while it is on your cat will prevent the collar from working properly.


This collar lasts way longer than many other brands do. The average maximum usage for flea and tick collars is between 1 and 2 months of continuous wear before the collar needs to be replaced. Hartz Ultraguard flea and tick collar for cats claim to last up to 7 months of full protection against pests, but some places on the website claim that it can last up to 14 months.

cat with flea collar lying on the bed
Image Credit: sharshonm, Shutterstock


Hartz Ultraguard flea and tick collar contain organophosphate insecticides such as tetrachlorvinphos as the main active ingredient to prevent and kill off fleas. However, this ingredient is controversial and could potentially be harmful to you, the environment, and your cat during long-term exposure.

Tetrachlorvinpos is also a recognized ingredient in the State of California believed to cause cancer, which is why Hartz has placed a disclaimer below the product to make customers aware of this. There is a lot of controversy as to whether these types of collars that contain tetrachlorvinphos are safe for cats, or if they should be avoided altogether. There have been some reports of the chemicals in the Hartz Ultraguard flea and tick cat collar causing burns to a cat’s skin along with irritation.

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How does the Hartz Ultraguard flea and tick collar work?

This is a modern version of flea and tick collars that uses an insecticide to kill and ward off fleas and ticks. It is placed around your cat’s neck and the chemical enters the hair pills to offer your cat full-body protection.

How long does the Hartz Ultraguard flea and tick collar take to kill pests?

Like most flea and tick collars, it begins working immediately, but you probably won’t see any of the benefits until your cat has been wearing it consistently for 2 weeks. The Hartz Ultraguard flea and tick collar lasts up to 7 months and then it will need to be replaced to ensure that your cat is always protected from fleas, ticks, and other pests like flies and lice.

Is the Hartz Ultraguard flea and tick collar safe?

The main active ingredient in the Hartz Ultraguard flea and tick collar has faced some controversy as to whether it is safe or not. Hartz recognizes that the ingredient tetrachlorvinphos is a potential carcinogen in humans and animals and could be potentially toxic during long-term exposure. There have also been reports of cats sustaining chemical burns from the collar, so cat owners are urged to be cautious when choosing this method of flea and tick treatment.

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What the Users Say

We took a look at reviews from verified customers to see what they thought of the Hartz Ultraguard flea and tick collar for cats. Many customers were pleased with the scent the collar has as it doesn’t smell like chemicals like many other brands do.

The collar also offered their cats over half a year’s worth of protection against fleas and ticks, and it is worth the price. Some customers were not happy with the chemicals used in this collar and claimed that it left chemical burns on their cats and that the ingredients were potentially dangerous.

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The Hartz Ultraguard flea and tick collar is a great affordable and simple investment if you want to control pests on your cat for up to 7 months. The product has a great safety feature and a refreshing scent that doesn’t leave your cat smelling like chemicals. You should first consult with your cat’s veterinarian before placing the collar on them, as one of the main active ingredients in this collar is potentially harmful to both humans and animals along with the environment.

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