Thank you for visiting

To log out and end your session, click "OK"


Refine Your Search

Hill's Prescription Diet Prescription Diet
Hill's Science Diet Science Diet
Hill's Ideal Balance Ideal Balance

Feline
Canine

Kitten Kitten
Adult 1+ Adult 1+
Mature <br/>Adult 7+
Mature
Adult 7+
Senior 11+ Senior 11+

Puppy Puppy
Adult 1+ Adult 1+
Mature <br/>Adult 7+
Mature
Adult 7+

Dry
Wet
Treats
Grain Free

By Health Condition

y/d™ Feline Thyroid Health

Click here
for a closer look

Hill's® Prescription Diet®
y/d™ Feline Thyroid Health

Prescription Diet y/d is the safe, effective and easy way to manage thyroid health. Clinically proven nutrition could help to restore thyroid health in 3 weeks.

Buy Now Buy Local

Share this product

Key Benefits

Easy. Effective. Safe.
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

Additional Info

Additional benefits for overall health
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

IMPORTANT
Because iodine intake from other food sources -- treats, another pet's food, etc. -- can compromise the effectiveness of low-iodine nutrition, it's critical that you follow your veterinarian's feeding instructions carefully and feed only y/d.

Feeding Guide

Daily Feeding Guide:

Important Feeding Information

  • These amounts are a starting point only. Your cat may need less or more food to maintain proper weight. Adjust as needed. If you are unsure, ask your veterinarian.
  • With your veterinarian's approval, mix increasing amounts of your cat's new food with decreasing amounts of the old food over a 7-day period.
  • Prescription Diet® formulas are available in a wide variety of dry foods and treats for your cat's unique needs, and canned foods with delicious flavors your cat will love. Supplementation with other foods or treats is unnecessary and may decrease the effectiveness of the food. When using with canned food, decrease the amount of dry food to avoid overfeeding.
  • Keep fresh water available at all times!
  • For best results, have your veterinarian monitor your cat's condition.
  • To prevent suffocation, keep this plastic bag out of the reach of pets and children.

Adult maintenance

Weight of CatAmount per Day
6 lb (2,7 kg) 1/4 cup (30 g) - 3/8 cup (45 g)
10 lb (4,5 kg) 3/8 cup (45 g) - 5/8 cup (80 g)
14 lb (6,4 kg) 1/2 cup (65 g) - 3/4 cup (95 g)
18 lb (8,2 kg) 2/3 cup (85 g) - 7/8 cup (110 g)

Average Nutrient And Caloric Contents

Dry 4147 kcal/kg (519 kcal/per cup²)

Nutrient
 
Dry Matter1
%
Protein36.3
Fat25.7
Carbohydrate (NFE)28.6
Crude Fiber3.1
Calcium0.95
Phosphorus0.66
Sodium0.26
Potassium0.83
Magnesium0.067
Taurine0.34
Carnitine651 ppm
Iodine0.2 mg/kg

References

1The nutrient in the product after moisture is removed. It is used to make direct comparisons of nutrient profiles of products with differing moisture contents.
²An eight fluid oz. measuring cup of y/d™ Feline Thyroid Health contains 4 oz. by weight.

Ingredients

Corn Gluten Meal, Animal Fat (preserved with mixed tocopherols and citric acid), 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, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin, 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, preserved with Mixed Tocopherols and Citric Acid, Phosphoric Acid, Beta-Carotene, Rosemary Extract.


y/d™ Feline Thyroid Health yd 052742149707,052742159706

Hill's® Prescription Diet® y/d™ Feline Thyroid Health 4.7 5 9 9
**SUCCESS!** It works! Try it--worth the investment & your cat is worth it! Happy story: Our beloved cat Batman saw the vet in March. He's about 13-yrs old & was diagnosed with "hyperthyroidism"--a common malady for older kitties. We tried the least invasive approach 1st: his diet. Per the vet, we switched him to low-iodine Rx food: y/d Feline Thyroid Health by Hill's Pet (wet & dry). Yesterday's check up: He gained ONE WHOLE POUND, his coat looks great, and his levels are back in NORMAL RANGE!!! Yessss--no meds! Normal is 0.8 to 4.0. Late March he was 10.4--crazy high. Yesterday he was 3.3! We owe it all to this stuff which is a MIRACLE food! If you have a cat with this prob, you've GOT to try it! Two paws up! THANK YOU to our Vet & to Hill's Pet. We're believers ... and so is Batman! NOTES: We shopped around & our vet was the cheapest outlet for y/d. Also, take advantage of the $7 off coupon, good for wet or dry y/d! May 14, 2013
Does work My female cat was diagnosed with Hyper thyroid 11/1/2011 and weighed 16.8 pounds at that time. Recently went to have her blood work completed and after just eating the dry Y/D cat food her levels are normal and she now weighs 9.4 pounds. The doctor was very pleased with the results. April 23, 2013
Not sure, my cat is unhappy My cat Marley is 14 and was diagnosed with thyroid an kidney issues. He was a very happy cat up until this and looked after and washed Tiggie aged 7. Vet recommended hills dry food, Marley liked it to start with but it is very difficult to separate my 2 cats at feeding time. they are use to swapping bowls just to see if the other one tastes better. Now I have to feed them in different rooms which upsets them. Marley the one with issues stopped eating the dried food so I went to the vets to get some of the tinned food. He liked that for a day or three but now just nibbles a little and craves for Tiggies food and is very unhappy. He has hardly eaten anything for 2 days and just wants to sleep. I was worried and picked him up off my bed and he spat at me and hissed. He has never done that before. However I carried him downstairs and presented him with his food but he was not interested. He ran away from me and 3 hours later has come home but doesn't trust me. Its like I have upset him! I'm tempted to feed both my cats together again on normal cat food but I'm confused. I don't want to harm Marley but I would like to see him happy again. Any suggestions please would be welcome. April 21, 2013
I'm a believer My 16 year old Molly showed slightly abnormal thyroid and kidney functions on a recent blood test. The vet suggested y/d. He told me this food would be good for both conditions. I was a little skeptical- my cat would only eat one kind of dry cat food previous to this. I started mixing in a little of the dry y/d with her regular food. After a couple of weeks she was eating the y/d without her old food mixed in! An unexpected benefit of the diet change- Molly had been throwing up fairly often- I thought she was trying to pass a hair ball, except there was rarely any hair. After switching to the y/d, she stopped thowing up! Whether that was due to an improvement in her thyroid/ liver function with the new food or just the quality of the new food I can't be sure, but it works!! I'm a believer!!! April 2, 2013
works well if your cat eats it my 14 year old cat has thyroid problems and has list a lot of weight. the vet said to try this out and see if it would help her. well my cat is a fussy eater and did not eat it this is a common problem. so we then have to give her a pill every night not what you would want to do before bed. March 6, 2013
Worked wonders on my cat. My 14 year old cat had thryoid health problem. He was losing weight and always trying to find find and eat food. He has been on this for six months. He has gained weight and eating very well. Yes it is bit expensive but its for my cat. January 22, 2013
Thanks to Dr Bob for Prescribing this food My 19yr old Sassy girl was losing weight quickly. She was diagnosed with a Throid problem. She would not take medication and Dr. Bob said she would not survive an operation.. He recomemded Feline Thyroid Health Diet.. I took her for a follow up blood test yesterday and her levels are now within normal range.....She started on the wet food about 3 months ago and now I give her the dry ONLY... much better for her teeth.... I only wish Hill's had prescription coupons to help with the cost.. January 11, 2013
Excellent results!!!! My 13+ yr old male cat Jeter was losing weight and seemed to be drinking a lot of water. Toward the end of August I noticed a slight head twitch like a seizure from time to time. I immediately took him to the Vet who was pretty sure from an exam that he had an enlarged thyroid. We did an entire blood work up including the thyroid. The thyroid came back elevated at 9.1 while all other bloodwork was normal. The Vet suggested we try the y/d diet only for 6-7 weeks then recheck the thyroid. Jeter prefers the dry food but eats a couple of teaspoons of wet food mixed with water per day. He eats between 1/2 - 2/3 cup of dry food per day. At his top weight he was 19.6 lbs. His weight in August was 13.6. He was initially tested on August 21st. He was retested on October 16th. WITH THE Y/D FOOD ONLY - his reading is now 2.3 which is within the normal range of .8 - 4.2. We were thrilled!!!!! He has more energy and there are no head twitches. He lost 2 ounces but we are hopeful he will put on a pound or so. He eats ONLY THIS FOOD. The Vet wants a retest in 6 months but expects the reading to come down further. I couldn't be more pleased and would HIGHLY recommend this food for any senior cat with thyroid issues!!!! October 31, 2012

NEW Hill's® Ideal Balance
Natural Pet Foods

100% Balanced Nutrition Guaranteed or your money back.

Ideal Balance 2.0

“Like” Hill’s on Facebook

Share special offers
Chat about your passion for pets
350,000 pet parents and growing

Join us in giving 7 million
more pets a home

Discover how pets benefit
daily from Hill’s Food Shelter
& LoveTM program.

Find a Shelter near you.