---
product_id: 13161153
title: "Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag"
brand: "hill's prescription diet"
price: "$399"
currency: NZD
in_stock: true
reviews_count: 12
category: "Hill's Prescription Diet"
url: https://www.desertcart.nz/products/13161153-hills-prescription-diet-y-d-thyroid-care-dry-cat-food
store_origin: NZ
region: New Zealand
---

# Clinically proven thyroid hormone reduction in 3 weeks High L-carnitine for lean muscle maintenance Omega-3 & 6 fatty acids support heart, kidney & coat health Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag

**Brand:** hill's prescription diet
**Price:** $399
**Availability:** ✅ In Stock

## Summary

> 🐾 Prescription power for a thriving, vibrant cat life!

## Quick Answers

- **What is this?** Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag by hill's prescription diet
- **How much does it cost?** $399 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/13161153-hills-prescription-diet-y-d-thyroid-care-dry-cat-food)

## Best For

- hill's prescription diet enthusiasts

## Why This Product

- Trusted hill's prescription diet brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Skin & Coat Glow-Up:** Omega-6 fatty acids deliver visible improvements in skin health and a shiny, enviable coat that turns heads.
- • **Vet-Recommended & Trusted:** #1 US vet recommended therapeutic diet—join thousands of proactive pet parents prioritizing expert-backed care.
- • **Fast-Acting Thyroid Support:** Only vet-formulated food clinically proven to lower thyroid hormones in just 3 weeks—exclusive nutrition your cat can’t get anywhere else.
- • **Lean Muscle & Vitality Boost:** Packed with L-carnitine to preserve your cat’s muscle tone and keep them active and agile.
- • **Heart & Kidney Wellness Formula:** Balanced phosphorus and reduced sodium combined with omega fatty acids to protect vital organs and promote longevity.

## Overview

Hill's Prescription Diet y/d Thyroid Care Dry Cat Food is a veterinary-formulated, clinically proven diet designed to reduce thyroid hormone production within 3 weeks when fed exclusively. It supports lean muscle with high L-carnitine, promotes heart and kidney health through controlled phosphorus and omega fatty acids, and enhances skin and coat condition. Trusted by veterinarians nationwide, this 8.5 lb bag offers a convenient, effective nutritional solution for managing feline hyperthyroidism.

## Description

Hill's Prescription Diet y/d Dry Cat Food is an easy and convenient way to manage a cat's overactive thyroid and the only clinically proven nutrition to decrease thyroid hormone production in 3 weeks when fed as the sole source of nutrition. It’s made in the USA with global ingredients you can trust, and was developed by Hill’s nutritionists and veterinarians. This food is also formulated to promote a urinary environment that reduces the risk of developing struvite and calcium oxalate crystals. Please consult your veterinarian for further information on how Prescription Diet foods can help your cat continue to enjoy a happy and active life.

Review: Effective & the cat likes it - My cat has thyroid issues but can only tolerate a small dose of the medicine, because it causes severe itching in some cats. The Science Diet Thyroid food has been the magic fill in. I use it in combination with a small dose of the medicine and it works. I've gotten her the canned food & she will eat it off & on.
Review: Actually works to control hyperthyroidism - So my 5 stars is not for the quality of this cat food. Necessarily. Let me explain. If you read the ingredients the food is basically hard nuggets of corn with synthetic vitamins. Would not have touched my precious fur monster's lips before she got sick with hyperthyroidism. We always tried to feed her with the highest quality cat food we could find, all natural, high protein, etc. She got sick anyway. Initially, we were able to get her hyperthyroidism under control with methimazole. And then only a month or so after victorious vet visit where her T levels were normal, she started getting sores on her face and in her ears from the methimazole. Due to the separation period involved with radioactive iodine treatment, we decided to try the food. I was very reticent but after reading through reviews on desertcart (thank you reviewers) I began to think it could work. And it has so far. Our 13yo old cat is back to her normal spoiled self! Her fur is even shiny and she seems to enjoy her hard little corn pellets. We also feed her the canned Y/D but she seems to prefer the kibble overall.

## Features

- Hill's Prescription Diet y/d Thyroid Care Dry Cat Food is specially formulated by Hill’s nutritionists and veterinarians to manage your cat’s overactive thyroid
- The only clinically proven nutrition to decrease thyroid hormone production in 3 weeks when fed as the sole source of nutrition. For best results, consistent and exclusive long term feeding of this product is critical for efficacy of the product benefits.
- Controlled phosphorus and reduced sodium with omega-3 fatty acids from fish oil to support kidney and heart health
- High levels of L-carnitine to maintain lean muscle mass and supports a healthy body condition
- Omega-6 fatty acids for visible improvements in skin & coat health
- Hill’s Prescription Diet is the #1 US Vet Recommended therapeutic pet food — consult with your vet to make sure Prescription Diet y/d is the right food for your cat

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008RDA5B6 |
| ASIN  | B008RDA5B6 |
| Age Range Description | Adult |
| Best Sellers Rank | #21,437 in Pet Supplies ( See Top 100 in Pet Supplies ) #29 in Veterinary Diet Cat Food |
| Brand Name | HILL'S PRESCRIPTION DIET |
| Breed Recommendation | All Breed Sizes |
| Care Instructions | Keep away from Children, Keep in a Dry Place |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (429) |
| Date First Available | July 31, 2012 |
| Date First Available  | July 31, 2012 |
| Department | cat-veterinary-diets |
| Department  | cat-veterinary-diets |
| Directions | Please see package for complete feeding instructions. Adjust amounts as necessary to maintain optimal weight. If you are unsure, ask your veterinarian. New this food? Mix increasing of pet's new food with decreasing the old over a 7 day period. Keep fresh water available at all times! Your nutritional needs may change they age. Ask vet every checkup. |
| Included Components | adult-cat-food |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 9.5 x 5.75 x 12.5 inches |
| Item Package Dimensions L x W x H | 17.95 x 9.96 x 4.33 inches |
| Item Weight | 8.5 Pounds |
| Item model number | 1497 |
| Item model number  | 1497 |
| Manufacturer | Hill's Pet Nutrition |
| Manufacturer  | Hill's Pet Nutrition |
| Manufacturer recommended age  | 1 month and up |
| Model Name | Hill's® Prescription Diet® y/d® Original |
| Number of Items | 1 |
| Product Dimensions  | 9.5 x 5.75 x 12.5 inches; 8.5 Pounds |
| Size | 8.5 Pound (Pack of 1) |
| Specific Uses for Product | Thyroid |
| Target Audience Keyword | cat, cats, dogs, house-cats |
| Warranty Description | 100% statisfaction, or your money back |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** HILL'S PRESCRIPTION DIET
- **Flavor:** Chicken
- **Item Form:** Dry Food
- **Specific Uses For Product:** Thyroid

## Images

![Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag - Image 1](https://m.media-amazon.com/images/I/714owdj-IrL.jpg)
![Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag - Image 2](https://m.media-amazon.com/images/I/71cleDiDYbL.jpg)
![Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag - Image 3](https://m.media-amazon.com/images/I/61orTr8jILL.jpg)
![Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag - Image 4](https://m.media-amazon.com/images/I/71VLWXrJGyL.jpg)
![Hill's Prescription Diet y/d Thyroid Care Dry Cat Food, Veterinary Diet, 8.5 lb. Bag - Image 5](https://m.media-amazon.com/images/I/61WjsGNdN0L.jpg)

## Available Options

This product comes in different **Size, Flavor** options.

## Questions & Answers

**Q: What is science-led nutrition?**
A: Nutrition inspired by science — not trends — creates differences you can see, feel and trust. Our food scientists understand the combinations of nutrients and ingredients to help support lifelong health.

**Q: How much should I feed my pet?**
A: Most Prescription Diet foods have a feeding guide on the package to help you determine the proper amount for your pet. It's critical to your pet's health that their physical condition be monitored regularly and the feeding amount adjusted as needed.

**Q: How can I tell if an unopened can or bag of cat or dog food is still good?**
A: The datecode on our plastic bags is located on the left gusset, near the 4 or 5-digit SKU number, toward the bottom of the bag. The datecode on our medium and large bags will be located on the top of the bag, generally the front flap.

**Q: How should I store my cat or dog’s dry food?**
A: Bags of dry Science Diet, Healthy Advantage and Prescription Diet cat or dog food should be stored in a cool, dry environment under 100°F (38°C).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Effective & the cat likes it
*by A***J on December 31, 2025*

My cat has thyroid issues but can only tolerate a small dose of the medicine, because it causes severe itching in some cats. The Science Diet Thyroid food has been the magic fill in. I use it in combination with a small dose of the medicine and it works. I've gotten her the canned food & she will eat it off & on.

### ⭐⭐⭐⭐⭐ Actually works to control hyperthyroidism
*by B***H on October 5, 2024*

So my 5 stars is not for the quality of this cat food. Necessarily. Let me explain. If you read the ingredients the food is basically hard nuggets of corn with synthetic vitamins. Would not have touched my precious fur monster's lips before she got sick with hyperthyroidism. We always tried to feed her with the highest quality cat food we could find, all natural, high protein, etc. She got sick anyway. Initially, we were able to get her hyperthyroidism under control with methimazole. And then only a month or so after victorious vet visit where her T levels were normal, she started getting sores on her face and in her ears from the methimazole. Due to the separation period involved with radioactive iodine treatment, we decided to try the food. I was very reticent but after reading through reviews on Amazon (thank you reviewers) I began to think it could work. And it has so far. Our 13yo old cat is back to her normal spoiled self! Her fur is even shiny and she seems to enjoy her hard little corn pellets. We also feed her the canned Y/D but she seems to prefer the kibble overall.

### ⭐⭐⭐⭐⭐ Great product
*by J***I on August 19, 2025*

What I need

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-18*