Hartz UltraGuard Rid Worm Dewormer for Roundworms for Cats, 4-oz bottle

By Hartz
Rated 3.6522 out of 5 stars
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Hartz UltraGuard Rid Worm Dewormer for Roundworms for Cats, 4-oz bottle slide 1 of 4
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Hartz UltraGuard Rid Worm Dewormer for Roundworms for Cats, 4-oz bottle slide 1 of 4
$7.62Chewy Price
$7.24Autoship Price
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About This Item

  • Easy-to-use solution to effectively remove roundworms from your cat or kitten.
  • Can be applied directly in your paw-tner’s mouth or in her food.
  • Works on adult cats and kittens eight weeks of age or older.
  • Store treatment in a cool, dry place and avoid temperatures above 86°F.
  • Repeat treatment every 14 days for best results.

Questions & Answers

5 Customer Questions

Does this work in tapeworms
Answer by ChewyAug 16, 2019
This feline deworming treatment is only formulated to be effective against large roundworms (Toxocara cati and Toxascaris leonina) in cats and kittens and may not effect tapeworms.

What’s the first treatment? It is several drops a day for several days or just a one day treatment?
Answer by ChewyApr 25, 2022
This easy-to-use syrup can be dropped directly into your pet's mouth or mixed into food once. The first treatment should be repeated 14 days later.

Is this safe for kittens over 2 pounds?
Answer by ChewySep 06, 2021
This may be used in cats 6-8 weeks of age.

Can o give this to my Yorkie he weighs 5lbs
Answer by ChewyDec 01, 2021
This dewormer is formulated for cats and kittens only. It should not be given to dogs.

ReviewsWrite a Review

Rated 3.6522 out of 5 stars
23 Reviews
Would recommend to a friend

23 Customer Reviews

Rated 1 out of 5 stars
By Meowees on Jul 28, 2022

Kitties don’t like this one

We bought both this Hartz UltraGuard Rid Worm and the HomeoPet WRM Clear Dewormer to try for our cat family of 7. I mixed a few drops of Hartz brand in their can food and NONE of our cats would touch it afterwards, not even the 3 little kittens. This Hartz brand also has a medicine smell to it. Our kitties don’t seem to notice the HomeoPet brand dewormer when it’s mixed in their food and it doesn’t have a smell to it so we’ll stick with that brand.

Rated 4 out of 5 stars
By arya on Jul 31, 2022

Great Dewormer .

This Dewormer worked well for my kittens they were around 10 weeks so we gave them half of the amount and seems there are no more work I'm very happy with this item.

Rated 3 out of 5 stars
By MnDsMomma on May 13, 2022

Takes more than one dose

I chose to purchase this particular worm medicine for my cat, only after reading the excellent reviews for it. There were many claiming that their pet showed improvement after the first dose... It didn't work that fast for my Miss Purdeigh. Which was disappointing. I just gave her a second dose (15 days after the first). I'm hoping she shows signs of the worms being gone.

Rated 5 out of 5 stars
By mimthiessen on Jul 8, 2022

Please return this shipping to you

We do not need it because I have several Ultra Guard Rid Worm bottles. Please stop sending to us. Thank you, Miriam

Rated 4 out of 5 stars
By Jean on May 17, 2022

Cat wormer

Seems to be working, haven't seen anymore worms. Have 9 feral cats I take care of. I put it in their wet food & they all seen to be looking better.

Rated 5 out of 5 stars
By Sandy on Jul 9, 2022

the cats in my life

I gave it to the kittens and already they are putting on weight

Rated 5 out of 5 stars
By NewCheweyFan on Jan 16, 2022

The Best !

Chewey is the best! Of all the items on all the sites I have ordered from , Chewey is the best at honest ‘ in-stock’ statements, shipping, arrival time notifications, product accuracy, product quality, wow.! Makes me look forward to ordering again, which will be soon and often due to my experiences! Thank you for your professionalism and service, sounds corney, but couldn’t be happier.

Rated 5 out of 5 stars
By sweetie on Apr 28, 2022


The products from chewy are very affordable compared to most department stores

Rated 5 out of 5 stars
By James on Oct 28, 2021

Genuinely Helped My 2 Year Old Cat

**MIX THIS WITH WET FOOD** First time using this product and it absolutely worked exactly as I needed it to. My cat got roundworms from eating bugs I believe, and I felt so bad for my poor baby. After mixing the appropriate dose with his wet food (I gave him 2 1/4 tsp as he’s ~12lbs). Although he’s a tripod he’s very active/muscular, but the worms had made him bloated, tired, and even caused him to lose his normal appetite. Within 4-6 hours of giving him the medicine he was much more active, and he was able to devour his dinner like he normally does. Within 24 hours his bloating had gone way down and he was practically back to his normal self. Within 2 days he was running around like a lunatic (aka his true normal self). I’ll be administering this for 2 more doses for 3 doses/6 weeks total (apparently this only kills adults so I want to make sure any developing worms die once they’re fully grown); but as long as you are attacking round worms this product works.

Rated 1 out of 5 stars
By dontbuythisproduct on Feb 3, 2022

de-wormer :(

it doesn’t work at all, i bought it because a lot of the reviews said it does but all animals are different. ngl i’m still upset.