PURINA PRO PLAN VETERINARY DIETS UR St/Ox Urinary Dry Cat Food, 6-lb bag - Chewy.com

Purina Pro Plan Veterinary Diets UR St/Ox Urinary Dry Cat Food

By Purina Pro Plan Veterinary Diets
Rated 4.5509 out of 5 stars
Veterinary Diet Item

$44.99Chewy Price
$42.74Autoship Price
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About This Item


  • Great-tasting dry cat food for urinary health.
  • Crafted in collaboration with nutritionists, researchers and veterinarians.
  • Specially formulated to help reduce the risk of urinary stone formation in cats.
  • Features high-quality protein and promotes increased urine volume for dilution.
  • Developed to help dissolve existing struvite stones while preventing both new stones and calcium oxalate crystals from forming in the future.

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Nutritional Information

Feeding Instructions


Play Video: Learn More About Purina Pro Plan Veterinary Diets From Our Team of Experts
Learn More About Purina Pro Plan Veterinary Diets From Our Team of Experts

About Purina Pro Plan Veterinary Diet Urinary 

Advanced Urinary Support

Purina Pro Plan Veterinary Diets UR Urinary St/Ox feline formulas are formulated to help reduce the risk of urinary stone formation. Made with high-quality ingredients, these veterinary diet recipes are available in several flavor and texture varieties to help you find your kitty’s favorites.

Great Taste and Texture

Made with the specific nutrition your cat needs, in flavors and textures that help ensure adequate nutrient intake.

Made by Experts

Science-based recipes developed by a collaborative network of scientists, veterinarians and nutritionists.

Exceptional Quality

In a typical day, Purina conducts 100,000+ quality checks on ingredients, processing, packaging, packing and receiving.

Responsible Sourcing

Each ingredient can be traced back to its trusted supplier, so quality may be evaluated all the way back to the source.

About Purina Pro Plan Veterinary Diets

Purina Pro Plan Veterinary Diets is committed to the health of every pet, especially those with unique nutritional needs. Established through decades of research and supported by a global network of scientists, each recipe is formulated to deliver advanced nutrition for your pet. For innovative therapeutic products trusted by pet owners and veterinary professionals alike, you can always count on Purina Pro Plan.

Shop Purina Pro Plan

Questions & Answers

23 Customer Questions

how do I remove this item from my cart?
Answer by DaniGSep 16, 2022
go to your card a tap remove or you can change the quantity to "0".

I have other (Healthy) cats in my household , is it okay if they eat this also. Only one cat has UR issues.
Answer by ChewyOct 30, 2018
Purina states that Animal feeding tests using AAFCO procedures substantiate that Purina Pro Plan Veterinary Diets UR Urinary St/Ox Feline Formula provides complete and balanced nutrition for maintenance of adult cats. This diet is formulated to meet the nutritional levels established by the AAFCO Cat Food Nutrient Profiles for maintenance of adult cats. With that said, this diet should not harm your healthy cats, but you should check with your vet for any particular feeding guideline or specific health concerns.

What is the percentage of moisture in this dry food?
Answer by ChewySep 01, 2020
This food has 122% moisture.

What flavor is this bag?
Answer by ChewyNov 15, 2017
This product's main flavor is chicken.

ReviewsWrite a Review

Rated 4.5509 out of 5 stars
481 Ratings
Would recommend to a friend

481 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 2 out of 5 stars
By Mitzuyan on Jun 6, 2023

Very unhappy with changes to this formula

I have been feeding my two cats Purina ProPlan for well over a year now, since one of my cats developed bladder stones. I chose Purina after carefully evaluating the nutritional content and comparing it to Hills and Royal Canin (It compared favorably). I like Purina, and was very happy with the food (as were my cats), that is UNTIL they changed the formula a few months back. The appearance of the bag changed, but otherwise, the changes in the formula were NOT made clearly evident, unless you read the fine print. I was told by a Purina agent the new formulation is better for overweight cats, but my cats--and I assume those of many others--are not overweight. The new formulation requires larger portions to achieve the same nutrition as the old formulation. This important information is NOT clearly communicated except in small print, so many people who have already been feeding their cats the OX/St diet may not notice that they now need to feed their cats larger portions of the new formulation, compared to the old formulation, in order to achieve adequate nutrition. It was only after noticing that my two cats were unusually hungry after eating the same portion of the new formula as they always received with the old formula, that I became aware of the issue. When I read the feeding instructions I realized why the cats were so hungry(Purina should have made this clearly evident on the new formula bags, so people don't underfeed their cats). The necessity of larger portions means that I am running out of catfood earlier than I would have with the old formula. Compared to the comparable formula offered by Hills in a 7 LB. bag, Purina's UR cat food comes in a smaller, 6 LB. bag. I am now running out of food sooner because of the change in formula. Because I receive orders of the food once a month, this is creating real headaches for me in terms of ordering! The texture of the kibble has changed in the new formula of Ox/St kibble. It is more porous and it deteriorates into crumbs more easily, so that by the time I get down to the final fifth of the bag, I am having to sift through crumbs to get primarily kibble and not crumbs, because the cats won't eat the crumbs. They don't like the crumbs, and neither do I. Please see the photograph of the large quantity of crumbs at the bottom of the bag, if the photo comes through. Sifting through the excessive crumbs is a royal pain! Whereas in the old formula, the second ingredient after corn gluten meal was chicken and poultry byproduct meal was third, now the second ingredient is chicken byproduct meal and there is no pure "chicken" ingredient at all. In summary, I am so disappointed with the new St/Ox, and I am hoping Purina will revert to the old formula, or at least offer both the old and new, lower-calorie formulas; otherwise, I will be investigating other brands to purchase.

Rated 5 out of 5 stars
By Jenny on May 26, 2023

Cats are happy

Started using about 5 yrs ago when Simon had crystals and a bladder blockage requiring surgery. He was not a fan of Royal Canin but Purina has stuck and no further issues. He is quite active and vocal for a 14 yr old. Wish the price was lower but glad it is made in the USA.

Rated 3 out of 5 stars
By Rae on May 9, 2023

Causing Fur and Skin issues

My cat was diagnosed with bladder stones and this food was recommended for her condition. Having multiple cats, we were told we could feed to all of them. The cat with stones - her head and neck are covered in scabby sores. The other cats' coats and skin are a mess (mats and dandruff for days). I'm sad that there isn't a higher quality bladder diet considering the price of this product.

Rated 5 out of 5 stars
By DMM7x on Apr 7, 2023

Same benefits for less--and they like it!

Our vet tells us the ProPlan UR has the same urinary benefits as similar higher-priced products from Royal Canin and Hills Science Diet...and our cats love it. Also, the ProPlan nutritional label shows it is higher in protein and lower in fat than the others, making it a better all around choice for at-risk cats whose parents are on a tight budget.

Rated 1 out of 5 stars
By zoomom on May 15, 2023

Cat will not eat this

My cat will not touch the dry or wet versions of this food. I’m at a loss as to what to do because he has urinary crystals. Unfortunately, this food is a no-go for our house.

Rated 5 out of 5 stars
By Ravyn on May 21, 2023

Great food

Cats love it! I was desperate for a solution to one of my kitties urinary issues. It keeps him happy and the rest of the babies love it too win win!

Rated 5 out of 5 stars
By Ryan on Feb 28, 2023

No more stones

One of my cats struggles from frequent bladder stones which was greatly reduced when we switched him to the over the counter Pro Plan urinary health. While that OTC food helped him a lot he would still get there occasional bladder stone. This most recent visit to the vet he recommended we switch him to this prescription food. Since switching him to the pro plan Vet diet we have not had anymore issues with bladder stones forming.

Rated 3 out of 5 stars
By Cricketsmom on Apr 6, 2023

UR ST/Ox made with TUNA now

When I started this food it was a solid white bag and the only protein was chicken. Three months later cat is vomiting. Vet said ita Tuna allergy. When the company rebranded they added tuna with no notice.

Rated 5 out of 5 stars
By ChristineA on Feb 16, 2023

Purina UR is GREAT!

One of my cats gets UTI's, so my vet recommended Purina ProPlan UR dry food. Both of my cats love it!!! And it does just what it's supposed to do, which is to encourage your cat to drink water. Both cats are drinking a lot of water and urinating more often, so they are being flushed out, which will help my cat that gets the UTI's a lot. Thank you Purina!!!

Rated 5 out of 5 stars
By Pati on May 11, 2023

Urinary diet for kitty

Alas....she is eating it! My contact person at Chewy was wonderful. Helpful, professional, and knows her stuff. Thank you!