Royal Canin Veterinary Diet Urinary UC Low Purine Dry Dog Food, 18-lb bag

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This prescription item requires vet approval. Details


Cystine stones (uroliths) occur when an inherited defect of the kidneys causes a build up of cystine in the dog’s urine. Cystine is an amino acid that is filtered and reabsorbed by the kidneys. The build up of this amino acid in the urine leads to the formation of cystine stones. Certain breeds are more affected than others by cystine urolithiasis. These include English Bulldogs, Newfoundlands, Dachshunds, Chihuahuas, and Mastiffs. Mixed breed dogs with the ancestry of these genetically susceptible breeds can also be affected.

Key Benefits

  • Canine Urinary UC Low Purine is a highly digestible, palatable, complete and balanced adult dog food formulated to meet the nutritional needs of adult dogs prone to urate, cysteine and xanthine urolithiasis.
  • Low purine proteins combined with the production of alkaline urine help reduce the risk of urate stones
  • Contains moderate quantities of high quality proteins and controlled methionine and cysteine levels
  • Formula increases the urine volume to simultaneously reduce the saturation of urine with struvite and calcium oxalate precursors. - See more at:
  • Enhanced levels of linoleic acid, zinc, and biotin help to promote a healthy skin and shiny coat

Note: Royal Canin Veterinary Diets require a veterinary prescription. This product will not be shipped until a copy of a valid prescription authorization is faxed to 1-800-619-7973 or e-mailed to

See all items by Royal Canin Veterinary Diet

  • Item Number
  • Weight
    18.0 pounds
  • Brand
    Royal Canin
  • Breed Size
    All Breeds, Small, Medium, Large
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Prescription Food

Nutritional Info


Brewers Rice, Corn, Wheat, Egg Product, Chicken Fat, Corn Gluten Meal, Natural Flavors, Monocalcium Phosphate, Wheat Gluten, Fish Oil, Calcium Carbonate, Potassium Chloride, Fructooligosaccharides, Salt, Taurine, Potassium Citrate, L-Lysine, Vitamins [Dl-Alpha Tocopherol Acetate (Source of Vitamin E), Inositol, Niacin Supplement, L-Ascorbyl-2-Polyphosphate (Source of Vitamin C), D-Calcium Pantothenate, Biotin, Pyridoxine Hydrochloride (Vitamin B6), Riboflavin Supplement, Thiamine Mononitrate (Vitamin B1), Vitamin A Acetate, Folic Acid, Vitamin B12 Supplement, Vitamin D3 Supplement], Choline Chloride, Trace Minerals [Zinc Proteinate, Zinc Oxide, Ferrous Sulfate, Manganese Proteinate, Manganous Oxide, Copper Sulfate, Calcium Iodate, Sodium Selenite, Copper Proteinate], L-Carnitine, Marigold Extract (Tagetes Erecta L.) Rosemary Extract, Preserved with Mixed Tocopherols and Citric Acid.

Caloric Content

3,718 kcal/kg, 338 kcal/cup

Guaranteed Analysis
Crude Protein 18.0% min
Crude Fat 13.0% min
Crude Fiber 3.1% max
Moisture 10.0% max
Cystine 0.3.0% min
Methionine 0.45% min

Feeding Instructions

Weight Tendency to Become Overweight Daily Feeding (Cups) Ideal Weight Daily Feeding (Cups)
4.4 lbs 1/2 1/2
6.6 lbs 5/8 3/4
8.8 lbs 3/4 7/8
11 lbs 7/8 1
15 lbs 1 1/8 1 1/2
22 lbs 1 1/2 1 3/4
33 lbs 2 2 3/8
44 lbs 2 1/2 2 7/8
55 lbs 3 3 3/8
66 lbs 3 3/8 3 7/8
77 lbs 3 3/4 4 3/8
88 lbs 4 1/4 4 7/8
99 lbs 4 5/8 5 3/8
110 lbs 5 5 3/4
132 lbs 5 3/4 6 5/8

Ensure fresh drinking water is available at all times.

Store this product is a cool, dry place.

Transition Instructions

We recommend at least a 7-day transition before you begin feeding the new food exclusively. Start by mixing 75% of the old diet with 25% of the new diet on Day 1 and Day 2. On Day 3 and Day 4, mix 50% of the old diet with 50% of the new diet. On Day 5 and Day 6, mix 25% of the old diet with 75% of the new diet. On the 7th day, you can feed the new food exclusively. This allows your pet’s digestive system to smoothly adapt to the new food.

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Customer Reviews

32 reviews 32 Reviews 4.8 out of 5 Stars

97% Recommend

97% of reviewersrecommend this product

4.8 / 5
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  • Low Purine Dog Food

    By on

    I recently adopted a 5 year old male Dalmatian. Knowing Dals are prone to bladder stones, I had his urine checked and found out he had crystals in his urine. After a bladder ultrasound which came back negative for any stones, my vet recommended this low purine diet to help prevent any stones from forming. I had another male before, that also had a history of stones, so I was familiar with the protocol. My Dal just loves the food, he eats it all up.

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  • Dog Loves It

    By on

    Our pup loooves this food! We had to put him on it after some bladder stone issues. He does eat more than it says to feed him though. He's still hungry after his serving and because he does not have obesity issues we do feed him more. I estimate that this bag will last about 3 weeks for our 95lb pup.

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  • Better than his other food

    By on

    My dog is required to have this food as a result of cystic bladder stones. It makes him pee a whole lot more (that's what it does) and he farts a whole lot more(side effect). He enjoys eating it as much as he did his other food and this is cheaper than the food we were buying him.

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  • My Dalmatian loves it!

    By on

    Having to be on a special diet is hard for a dog to understand but it maintains his health perfectly and even better, he loves it. I mean drool while the kibbles hit the bowl!

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  • Good product for UC dog diet

    By on

    This food has a much lower fat content than other UC prescription foods, so it helps keep weight down. Buying it from was quick and easy. They emailed me for a copy of the prescription, or gave me the choice to have them call my vet. Once I sent a copy, the shipment went out and it arrived within 2 days. It also cost me $20 less than at our vet. Bravo!

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  • Great for my picky eater

    By on

    Our mastiff was used to raw or dehydrated food before having to switch over to a prescription diet due to bladder stones. Initially, our vet recommended Hills, but our picky eater HATED it. Only ate it because we weren't giving him anything else. Since switching to Royal Canin's UC Low Purine dry food, he doesn't chow down like he does his frozen duck patties, but he's much more accepting of it without too much delay. I'm so relieved! I'll be setting up the auto-delivery for sure.

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  • Great food. Need smaller breed size

    By on

    This food is great for my Yorkie and his urinary diet. The pieces are too big for a little pup though and I wish they had a small breed option.

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  • I thought that your service was excellent and delivery to be the same.

    By on

    Your online ordering and catalog system was very easy to use. I was very pleased with the turn around time given the fact that you had to contact my veterinarian. I ordered on one day and you contacted my vet and shipped the next. I had the delivery in four business days from the date of order. Well done and very efficient.

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  • Great service!

    By on

    The food was delivered quickly, was fresh and the cost was less than at my local vets! Very pleased.

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  • This product meets the dietary needs of my dog and not only that she loves it!

    By on

    After trying other prescription dog food that just wasn't making the grade as far as being palatable my girl took to this food immediately

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