Hill's Prescription Diet y/d Thyroid Care Original Dry Cat Food

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8.5-lb bag
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Hill's Prescription Diet y/d Thyroid Care is the safe, effective and easy way to manage thyroid health. Clinically proven nutrition to restore thyroid health in 3 weeks.

Key Benefits

  • Clinically proven to improve thyroid health in 3 weeks when fed as the sole source of nutrition
  • Decreases T4 hormone production while supporting kidney, heart and urinary health
  • Helps support a healthy body condition and a healthy immune system while also promoting a visible improvement in skin and coat
  • This recipe has limited iodine and controlled phosphorus and low sodium
  • Promotes desirable urine pH levels and is high in taurine, L-carnitine and omega 3 fatty acids

Special Note

Hill's Prescription 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 rx@chewy.com.

See all items by Hill's Prescription Diet

  • Item Number
  • Brand
    Hill's, Science Diet
  • Food Form
    Dry Food
  • Lifestage
  • Made in
    United States
  • Special Diet
    Prescription Food

Nutritional Info


  1. Corn Gluten Meal, Pork Fat, Whole Grain Corn, Soybean Mill Run, Dried Egg Product, L-Lysine, Chicken Liver Flavor, Potassium Citrate, Lactic Acid, Dicalcium Phosphate, Vitamins (L-Ascorbyl-2-Polyphosphate (Source of Vitamin C), Vitamin E Supplement, Niacin Supplement, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin Supplement, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Vitamin D3 Supplement), Fish Oil, Choline Chloride, Calcium Carbonate, Calcium Sulfate, Dl-Methionine, Taurine, Vitamin E Supplement, L-Tryptophan, Natural Flavor, Minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Sulfate), L-Carnitine, Mixed Tocopherols for Freshness, Phosphoric Acid, Beta-Carotene, Natural Flavors.

Caloric Content

  1. 517 kcal/cup
Guaranteed Analysis
Crude Protein 30.0% min
Crude Fat 20.0% min
Crude Fiber 3.5% max
Phosphorus 0.45% min
Phosphorus 0.85% max
Sodium 0.3% max
Iodine 0.2% max
Taurine 0.15% min
Carnitine 200 ppm min

Feeding Instructions

Because iodine intake from other food sources -- treats, another cats food, etc. -- can compromise the effectiveness of low-iodine nutrition, its critical that you follow your veterinarians feeding instructions carefully and feed only y/d.Adjust feeding amounts as necessary to maintain optimal weight. If you are unsure, ask your veterinarian. For best results & safety practices: Gradually transition to your pets new food over a 7 day period. Exclusively feed the recommended Prescription Diet dry and/or canned food. Keep fresh water available at all times. Have your veterinarian monitor your pets condition.

Transition Instructions

A gradual transition to a new pet food is important to avoid digestive upset. To transition, mix your pet’s current food with the new food. Over 7 days, gradually decrease the amount of the current pet food while increasing the amount of new pet food. In some cases, your veterinarian may recommend no transition or a shorter transition time.

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Customer Reviews

109 reviews 109 Reviews 4.7 out of 5 Stars
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97% Recommend

97% of reviewersrecommend this product

4.7 / 5
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  • Not Tastey

    By on

    My cat does not like this food. She just nibbles at it. I am going to have to find a way to prepare it so she will eat it. The food does work Because her T cells went down. This was a surprise to me because she ate such a small amount.

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  • Three weeks and counting

    By on

    My cat, Crystal, is 14 yrs old and down to 8 lbs from 14lbs. Other options were not viable due to her age and nervous nature. After just 3 weeks she has gained a little weight and her coat looks much better. She loved the food from bowl one. Keeping our fingers crossed.

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  • Good stuff

    By on

    My cat likes this food, had no problem switching form his previous food. So far it's managing the thyroid problem just fine, he's a healthy, soon to be fourteen year old with glossy fur and I'm grateful for this easy solution and grateful for chewy dot com for their amazing fast shipping.

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  • Good product

    By on

    Good product, too expensive for a food just because they take out potassum iodide that should not be in the food in the first place.

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  • Very happy customer.

    By on

    I could not be more happier with the Science Diet Thyroid diet y/d and the wet can food y/d. They went to it right away, at least Allyson did, she was the one with the problem. Abby it took a little longer for her, she is on the dry and she gets a different wet food. But, I hope this will help in there recovery in the long run. I love your company, such great service ,speedy delivery. I am one happy camper. Thank you, Ms. Bonnie Sella

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  • High quality!!

    By on

    The Hill's Prescription Diet Y/D feline formula was received within 2 business days and was 1) a bigger bag than I could get locally, and 2) far cheaper when I signed up for auto shipments and was a 1st time customer!! I also ordered a Sergeant's fine tooth undercoat comb / brush combo tool, and love it too!

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  • It works

    By on

    my cat has hyperthyroidism. The blood test was REALLY really negative. We tried medicine but the med was affecting my cat's liver horribly. Stopped med and tried food. Cat thinks it okay...not loving it, but eating it. I am very happy, since the vet said thyroid irradiation would be next option to over $3K or so. He just needs to gain weight. I only ask Hills to work on better tasting food LOL.

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  • Hill's y/d rx diet

    By on

    Very happy to see my cat's progress with his weight getting better and he likes his y/d dry food.

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  • Rave reviews from my 2 cats!

    By on

    My 2 cats give this food rave reviews! My 10 year old cat with thyroid problems loves this dry food, easy for her to eat, too. My young 3 year old normal cat also loves to crunch these nuggets. Both dry and wet food have really helped my 10 year old to regain her normal weight quickly, plus receiving thyroid medicine. Love this product!! Great store, also!

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  • I love it thanks Mum

    By on

    My mum bought this for me as my thyroid numbers are a little high but don't tell her as I love it thanks chewy

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