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

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8.5-lb bag
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  • 8.5-lb bag

Product Description

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 nutrition to restore thyroid health
  • Improves thyroid health in 3 weeks* (when fed as the sole source of nutrition)
  • Complete daily nutrition with a taste your cat will love
  • Supports kidney health with controlled phosphorus and low sodium
  • Helps maintain bladder health with controlled mineral levels
  • Promotes heart health with essential nutrients like taurine and carnitine
  • Promotes healthy skin and a luxurious hair coat with high levels of omega-3 and -6 fatty acids

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

See all items by Hill's Prescription Diet »

Item Number 69819
Food Form
  • Dry Food
  • Science Diet
  • Hill's Science Diet
Country of Origin
  • United States
Special Diet
  • Prescription Food
  • Adult

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Important Information


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

Customer Ratings & Reviews

Rated 4.7 out of 5 by 44 reviewers.
Rated 5 out of 5 by working great for my 16 year old. My 16 year old started becoming lethargic, mangey coat, and losing weight about a year ago and turned out to be thyroid. I didn't know if I could pill him at the same time every day, so we gave this a shot. There was a visible difference in appearance and activity in the first two weeks. At 30 day checkup his levels were back to within normal range. Vet was surprised since we were just the 2nd patient to try this. It's been 18 months now and still doing great. Wish there was a y/d treat I could give him. December 18, 2013
Rated 5 out of 5 by Working GREAT!!! My senior male cat was diagnosed with hyperthyroidism earlier this year and I was given the option of daily pills or switching his cat food. For convenience I chose the food against my vet's preference since he said he's never gotten good results using the food. Mind you, this is the stinkiest dry cat food I've ever fed (which made me worry that my finicky cat wouldn't eat it# but it must be palatable because he eats it just fine. His original thyroid level was around 14.5 and should be from 1 to 4 to be normal. Within three weeks, he was back to around 5.5 and my vet was utterly amazed and hopeful that this treatment may work for other patients at his clinic. After another 3 weeks, the level wad down to around 4, so we're thrilled. His next appointment is three months away, but based on all evidence to date, this food had done the trick. It's hard not to let him cheat and have a treat occasionaly #which would contain iodine), but he's a trooper. October 18, 2013
Rated 5 out of 5 by It really works without medicine. My cat is 13 years old. She was vomiting, grooming herself bald, loosing weight, and meowing excessively. In just a few days it all stopped. I am excited to take her back to the vet to let them see the results. It's important to make sure this is the only thing she eats. I leave the dry food out during the day while we're gone and give her some of the canned in the evening. April 27, 2014
Rated 5 out of 5 by Food has resolved geriatric cat's thyroid issues My 13 year old cat, Flap, had stopped eating. She had lost 2.5 pounds in 3 months (has always been on the obese side). She was diagnosed with thyroid disease. YD seems to be right up her alley. She gobbles it down, and her thyroid numbers are back to normal. The difficulty with this cat is that she resists all attempts to medicate her, so the food was my last resort. It worked - thank goodness, so she will continue to be 'sister' to my geriatric dog (14) November 5, 2013
Rated 5 out of 5 by doctor recommended Our veterinarian recommended this product when she prescribed thyroid diet changes for our cat Peaches. Peaches used to cry for food all the time, now he is satisfied after a meal and gaining weight. He seems happier and more content these days....adjusting to his sight loss. It was very difficult to see his distress and not be able to calm him and that isn't a problem now after changing his diet to Hill's. July 28, 2014
Rated 4 out of 5 by My cat is spoiled I was using the wet food (medicated) and he loved it but I decided to try the dry food. Well, my cat was not happy. He demanded and waited for the wet food. Its been two weeks now, he demands a lot less and because you can not feed any other food because it can dilute the effects of the medication, I give him tasty treats. I did notice his eyes are looking better, he is drinking a lot more water and is vocal as can be. November 24, 2013
Rated 5 out of 5 by It Works! I am generally not a big fan of Rx food as the protein quality tends to be very poor; however this food (I use both the kibble and the wet food for my kitty) does work to lower my kitty's thyroid levels back to the normal range. My Edmond was on this food for 5 weeks and when his levels were retested, they were back to normal! The key with the food is to ensure that they only eat the Rx food and don't have access to any other food or treats. As my household has multiple cats, I have to shut Edmond in a separate room. The best thing about the food is that if it works for your kitty you don't have to resort to thyroid medication, which can have nasty side effects in some cats. September 5, 2014
Rated 5 out of 5 by works We got our first bag of this at the vet's office. Our cat, who had always been a dry food eater, would barely touch it at first. She's always been finicky. We almost gave up, but we got her the canned (which she took to immediately) and then just left her a handful of the dry out for when we weren't around. It grew on her over time - at first that handful was picked at, but we ended up having to leave more and more. Now it's to the point where she almost prefers the dry! Both version seem to work as advertised, BTW - she is clearly healthier and more energetic, not to mention vocal :) June 13, 2014
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