HARTZ UltraGuard Rid Worm Dewormer for Roundworms for Cats, 4-oz bottle - Chewy.com

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

By Hartz
Rated 3.881 out of 5 stars
$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.

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Questions & Answers

8 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.

can this be used on dogs to
Answer by ChewyDec 30, 2022
This treatment is specifically intended for use with cats.

Can this be given to a 9 year old cat?
Answer by ChewyDec 09, 2022
This product is suitable for use on cats and kittens 8 weeks of age and older. Consult a veterinarian before using in severely debilitated animals.

ReviewsWrite a Review

Rated 3.881 out of 5 stars
42 Reviews
Would recommend to a friend

42 Customer Reviews

Filter by reviews that mention

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 5 out of 5 stars
By Lizgigi on Feb 27, 2023

Works great & received my order quickly

This works for my feral cat. He's been coming around for sometime now. I feed him & provide a shelter in the winter, but I recently noticed he had round worms. Gave this to him in his food as directed and no more worms. I also like that I received exactly what I ordered which seems to be a problem nowadays with online purchases.

Rated 5 out of 5 stars
By Shelly on Feb 24, 2023

Good item for price

I can't get close to the ferals I feed to properly deworm them. This product does help with the infestations.

Rated 5 out of 5 stars
By samyy on Mar 19, 2023

Awesome Service and Product

Awesome Service and Product. i ordered many times on Chewy im glad work with chewy.

Rated 4 out of 5 stars
By Kittie on Nov 7, 2022

Good starter product

This product worked ok to get my kitten started on her first deworming, but it is best to follow up with your veterinarian for the second round of deworming, to make sure all worms are eradicated. Also read instructions on the bottle label, as the animal has to be of a certain weight before deworming can be initiated safely.

Rated 5 out of 5 stars
By Tama on Jan 6, 2023


This was easy to give to my cat, especially with his cooperation! It was fast acting and it helped him a bunch. I haven't seen any worms since.

Rated 1 out of 5 stars
By CatMomma8 on Oct 24, 2022

Might work if they'll gag it down

This stuff is useless. For starters, an average adult cat would need 10-15 mL of this stuff. Seriously?? That's a TON. And it's caramel flavor. Why?? How many cat treats can you find in caramel flavor. Zero. Because they hate it. Tried mixing with chicken. Nope. Tried an oral syringe. Nope. This stuff is junk. Use something else. Chucked mine in the garbage. Cat opinion photo included.

Rated 5 out of 5 stars
By Madox on Jan 9, 2023

So far great

It came quickly as it said it would. I gave my cat it's first dose and so far she's acting happier. I'll give the 2nd dose in a week.

Rated 5 out of 5 stars
By Muttley on Sep 20, 2022

Affordable, Effective Protection

Beginning in the 70's & through the decades, the only medical products my mother ever needed for our cats & dogs was Mycodex shampoo, Hartz earmite drops, & this liquid wormer. 45 years later Im still using these same three... Dogs & cats are a pleasure to take care of, & food and medicine for them takes so little time. Ever since coming of age & having pets of my own Ive never had a vet bill

Rated 5 out of 5 stars
By Sandra on Feb 4, 2023

Works well

Gave two doses to my cat so far and definitely have seen improvement

Rated 1 out of 5 stars
By donw on Dec 5, 2022

Rid worm junk in a bottle

Tried 4 treatments on 3 cat. Didn't work at all. Total waste of money and time