The Best Cat Food for Hyperthyroidism

Here is our comprehensive review of the 10 best cat food for hyperthyroidism in 2021.

It can be difficult for you to watch your pet suffering from hyperthyroidism. However, if you are aware of the best diet for hyperthyroidism, you can help the feline to remain active.

In felines, hyperthyroidism is a common disorder and generally occurs in middle-aged or older cats. [1] It occurs when the thyroid gland produces excess thyroid hormones (T4 and T3) in kitties. [2] Feeding the right diet is one of the best methods to cure hyperthyroidism in your furry pets. [3]

The Best Cat Food for Hyperthyroidism

As a cat lover, I felt the need to create the best cat food for hyperthyroidism. After testing every diet for several months, I found that Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food is the ultimate feline diet for hyperthyroidism.

Offering a particular diet is crucial to treat hyperthyroidism in your furry friend. The best formula for hyperthyroidism fulfills the nutritional needs of the cat. It can restore the feline from muscle-wasting disorder. It does not contain chemicals and ingredients that might worsen this disease. [4]

The ultimate diet for hyperthyroid cats will have more animal protein, less plant protein, and low carbohydrate content. It contains moderate amounts of fat and does not include harmful ingredients. Considering these criteria, Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food is the best cat food for hyperthyroidism. It is a veterinarian diet and meets all the primary conditions to be the topmost diet for hyperthyroid felines.

Not all hyperthyroid cats have the same symptoms and severity. Because of this, I reviewed many food products from different categories.

Scroll down to discover the best diets and other essential information about hyperthyroidism in your furry pets.

Contents

Top Ten Best Cat Food For Hyperthyroidism Reviewed 

  •  Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food – Best Overall Cat Food For Hyperthyroidism 
  •  Wellness Complete Health Pate Chicken Entree Grain-Free Canned Cat Food – Best For Skin And Coat Health In Cats With Hyperthyroidism 
  •  Royal Canin Veterinary Diet Renal Support D Thin Slices in Gravy Canned Cat Food – Best Formula For Kidney Health In Hyperthyroid Cats 
  •  Hound & Gatos 98% Gamebird Poultry Formula Grain-Free Canned Cat Food – Best High Animal Protein Diet For Cats With Hyperthyroidism 
  •  Feline Natural Chicken & Venison Feast Grain-Free Canned Cat Food – Best Food For Hyperthyroidism In Senior Cats 
  •  Hill’s Prescription Diet y/d Thyroid Care Original Dry Cat Food – Best Dry Cat Food For Hyperthyroidism 
  •  Dr. Elsey’s clean protein Chicken Formula Grain-Free Dry Cat Food – Best For Bowel Movements In Hyperthyroid Cats 
  •  Kitten Chow Nurture Muscle & Brain Development Dry Cat Food – Best Muscle Development Cat Food In Hyperthyroid Cats 
  •  Blue Buffalo Sensitive Stomach Chicken Recipe Adult Dry Cat Food – Best Gastrointestinal Diet For Cats With Hyperthyroidism 
  •  Merrick Purrfect Bistro Grain-Free Chicken Pate Canned Cat Food – Best Cat Food For Hyperthyroid Picky Eaters 

In this list, all the ten best diets surpass the basic nutritional profile guidelines set by AAFCO. [5] Taking to the veterinarian before feeding any special diet to your furry friend is advised.

1. Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food – Best Overall Cat Food For Hyperthyroidism 

  •  First 5 Ingredients: Pork Liver, Pork By-Products, Chicken, Corn Flour, Rice   
  •  Guaranteed Analysis: 8% Crude Protein, 6% Crude Fat, 1.5% Crude Fiber, 0% Moisture
  •  Caloric Content: 188 kcal/5.5 oz can  
  •  Key Feature: Best complete diet for cats with hyperthyroidism
  •  Type of Product: Pea-Free, Prescription-only Veterinary Diet
  •  Life Stage: Adult
  •  Best for: Best overall feline food for hyperthyroid cats

The Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food is the best alternative for felines who can not endure other treatments.

It is clinically verified that using this kind of formula for about three weeks in hyperthyroid cats can reduce the T4 thyroid hormone levels. Besides that, feeding it for some months can make your furry pet normal. [6]

This diet can restrict the overproduction of thyroid hormones. On a dry matter basis, this food contains 51.61% proteins and 9.68% fiber. It improves the heart health of your kitty with valuable nutrients such as carnitine and taurine.

It maintains kidney health and controls the low sodium and phosphorus content in your pet. Besides that, it can support bladder health with moderate mineral content.

Veterinary prescription required! 

2. Wellness Complete Health Pate Chicken Entree Grain-Free Canned Cat Food – Best For Skin And Coat Health In Cats With Hyperthyroidism 

  •  First 5 Ingredients: Chicken, Chicken Liver, Turkey, Chicken Broth, Carrots   
  •  Guaranteed Analysis: 10.5% Crude Protein, 7% Crude Fat, 1% Crude Fiber, 78% Moisture
  •  Caloric Content: 1,166 kcal/kg
  •  Key Feature: Best diet for coat and skin health in cats with hyperthyroidism
  •  Type of Product: No Corn No Wheat No Soy, Grain-Free, Pea-Free
  •  Life Stage: Adult
  •  Best for: Best formula for skin and coat health in hyperthyroid cats  

The Wellness Complete Health Pate Chicken Entree Grain-Free Canned Cat Food offers a well-balanced diet for boosting overall health.  

Poor or vulnerable skin and coat are some of the typical signs of hyperthyroidism. This diet helps in promoting the healthy and clear coat and skin of the cat. It is a grain-free wet food that has optimum moisture content.   

It features chicken as the primary protein source, which helps in maintaining lean muscles. Strong gums, active teeth, high energy, and a healthy stomach are a few benefits of this formula.  

This recipe is filled with vitamins and essential minerals. It has cranberries, which are high in antioxidants. There are optimum omega fatty acids and taurine content to promote the immune and well-being of your furry friend.

3. Royal Canin Veterinary Diet Renal Support D Thin Slices in Gravy Canned Cat Food – Best Formula For Kidney Health In Hyperthyroid Cats   

  •  First 5 Ingredients: Chicken By-Products, Chicken Liver, Pork Liver, Chicken, Wheat Flour
  •  Guaranteed Analysis: 6.5% to 10 Crude Protein, 6.5% Crude Fat, 1.7% Crude Fiber, 78.5% Moisture
  •  Caloric Content: 1,149 kcal/kg
  •  Key Feature: Best renal diet for hyperthyroid cats
  •  Type of Product: Low-Protein, Pea-Free, Prescription-only Veterinary Diet
  •  Life Stage: Adult
  •  Best for: Best diet for kidney health in cats with hyperthyroidism

The Royal Canin Veterinary Diet Renal Support D Thin Slices in Gravy Canned Cat Food features real chicken as the primary ingredient. Besides that, your furry pet can also obtain the essential nutrition of pork.

Chronic kidney disease is a typical risk factor associated with hyperthyroidism. You can feed this formula to your cat to boost its renal health. Plus, this is an exclusive veterinarian diet created to maintain healthy kidneys in adult kitties.

It has high antioxidants and fatty acids from fish oil. The limited phosphorus and modified protein levels improve kidney function.

This diet helps to stimulate lost appetite in cats. It is an energy-dense recipe and can decrease the overall meal volume. Because of this, this diet is also good for weight management in cats.  

Veterinary prescription required! 

4. Hound & Gatos 98% Gamebird Poultry Formula Grain-Free Canned Cat Food – Best High Animal Protein Diet For Cats With Hyperthyroidism 

  •  First 5 Ingredients: Turkey, Duck, Duck Broth, Turkey Liver, Guinea Fowl   
  •  Guaranteed Analysis: 10.50% Crude Protein, 8.50% Crude Fat, 1% Crude Fiber, 78% Moisture
  •  Caloric Content: 1,222 kcal/kg
  •  Key Feature: Best complete protein diet for cats with hyperthyroidism
  •  Type of Product: Gluten-Free, Grain-Free, No Corn No Wheat No Soy, Pea-Free, High-Protein, Limited Ingredient Diet, Natural
  •  Life Stage: Adult
  •  Best for: Best high protein formula for hyperthyroid cats

The Hound & Gatos 98% Gamebird Poultry Formula Grain-Free Canned Cat Food includes animal protein from the turkey and duck. It comes with a palatable aroma that motivates your furry friend to eat.

It offers 98% high-quality animal protein, and a protein-rich diet is essential for hyperthyroid kitties. This canned diet is moisture-rich because the ingredients are filled in duck broth.

This diet is made without using plant protein, which your furry pet can not digest properly. It uses no grains and gluten. Besides that, this formula is 100% free from harmful chemicals, additives, artificial colors, and flavors.

You can feed this complete diet to cats of all ages, weights, and breed. There are fair amounts of vitamin B12, D3, and E for managing optimal health.

5. Feline Natural Chicken & Venison Feast Grain-Free Canned Cat Food – Best Food For Hyperthyroidism In Senior Cats 

  •  First 5 Ingredients: Chicken, Venison, Water Sufficient for Processing, Venison Kidney, Venison Liver   
  •  Guaranteed Analysis: 9% Crude Protein, 5% Crude Fat, 0.20% Crude Fiber, 82.50% Moisture
  •  Caloric Content: 862 kcal/kg
  •  Key Feature: Best recipe for senior cats with hyperthyroidism     
  •  Type of Product: Grain-Free, Gluten-Free, No Corn No Wheat No Soy, High-Protein, Limited Ingredient Diet, Pea-Free, Non-GMO
  •  Life Stage: Adult
  •  Best for: Best diet for senior felines suffering from hyperthyroidism

The Feline Natural Chicken & Venison Feast Grain-Free Canned Cat Food is a perfect formula if you have an old cat. This diet features free-range and grass-fed chicken and venison, which come from the farms of New Zealand.

It includes venison, a novel protein that offers essential nutrition for kitties. This diet contains New Zealand green-lipped mussels. It delivers high amounts of omega-3 fatty acids, which are not available in other marine and plant-based foods.

Though this is excellent for senior cats, you can give this food to your cats of all ages and breeds. It is a natural recipe that does not use wheat, soy, rice, and gluten. It is also free of artificial additives, ingredients, and preservatives.

6. Hill’s Prescription Diet y/d Thyroid Care Original Dry Cat Food – Best Dry Cat Food For Hyperthyroidism 

  •  First 5 Ingredients: Corn Gluten Meal, Pork Fat, Whole Grain Corn, Soybean Mill Run, Egg Product   
  •  Guaranteed Analysis: 30% Crude Protein, 20% Crude Fat, 3.5% Crude Fiber, 0% Moisture
  •  Caloric Content: 517 kcal/cup
  •  Key Feature: Best dry diet for hyperthyroidism in cats    
  •  Type of Product: Pea-Free, Prescription-only Veterinary Diet
  •  Life Stage: Adult
  •  Best for: Best dry food for cats with hyperthyroidism  

The Hill’s Prescription Diet y/d Thyroid Care Original Dry Cat Food is a clinically proven formula. It can enhance thyroid health in around three weeks if you feed it as the primary and exclusive source of nutrition.

This diet helps to reduce the T4 hormone generation. Simultaneously, it can maintain the renal health of your furry pets. The fatty acids are responsible for supporting the skin and coat of your cat.

It can strengthen the whole body condition and promotes a high immune system in cats. This formula is a better option for enhancing the kidney and heart health of your pet.

It is made with S+OXSHIELD to fulfill particular nutritional standards. It can boost the urinary health of your feline. Besides that, it helps to decrease the struvite and calcium oxalate crystals in kitties.

7. Dr. Elsey’s cleanprotein Chicken Formula Grain-Free Dry Cat Food – Best For Bowel Movements In Hyperthyroid Cats  

  •  First 5 Ingredients: Chicken, Dried Egg Product, Pork Protein Isolate, Gelatin, Chicken Fat    
  •  Guaranteed Analysis: 59% Crude Protein, 18% Crude Fat, 4% Crude Fiber, 12% Moisture
  •  Caloric Content: 4,030 kcal/kg
  •  Key Feature: Best for sensitive bowel movements in cats with hyperthyroidism
  •  Type of Product: Grain-Free, Gluten-Free, High-Protein, Pea-Free, No Corn No Wheat No Soy
  •  Life Stage: Adult
  •  Best for: Best diet for healthy bowel movements in hyperthyroid cats   

Dr. Elsey’s clean protein Chicken Formula Grain-Free Dry Cat Food comes with around 90% of protein. This animal-based protein content helps to improve the body mass in your skinny felines.

Hyperthyroidism can affect the metabolism and bowel movements of your furry friend. This diet is perfect for digestion, and it ensures comfortable stools in your cats.     

It is a low glycemic mixture that contains only 4% of calories from different carbohydrates. Besides that, this diet can be effective in avoiding calcium oxalate crystals and bladder stones. This recipe is a 100% grain, filler, and gluten-free diet.

It is loaded with essential minerals and vitamins for boosting overall health. It comes with beneficial nutrients such as omega-3 fatty acids and taurine.

8. Kitten Chow Nurture Muscle & Brain Development Dry Cat Food – Best Muscle Development Cat Food For Hyperthyroidism 

  •  First 5 Ingredients: Chicken By-Product Meal, Corn Gluten Meal, Rice, Soy Flour, Beef Fat   
  •  Guaranteed Analysis: 40% Crude Protein, 13.5% Crude Fat, 2.5% Crude Fiber, 12% Moisture
  •  Caloric Content: 3,705 kcal/kg
  •  Key Feature: Best formula for muscle gain in cats with hyperthyroidism      
  •  Type of Product: High-Protein, Pea-Free
  •  Life Stage: Kitten  
  •  Best for: Best cat food for boosting muscles in hyperthyroid cats

The Kitten Chow Nurture Muscle & Brain Development Dry Cat Food contains farm-raised chicken. It helps in producing a protein-rich dry kibble which your kittens would carve to eat more.

As the kittens are tiny and not yet fully developed, you can feed this diet for their lean muscle development. It comes with essential DHA, which boosts vision and brain growth.

This diet contains crucial nutrients that are present in the mother’s milk. Because of this, your baby furry pet can remain healthy and grow strong. It is a pea-free recipe and has a tasty aroma and texture. With each serving, your pet will become more healthy.

It uses high-quality and fresh sourced ingredients. There are vitamins A, B1, B2, B3, B5, B6, B7, B9, B12, D3, E, and K. This diet does not have artificial flavors and colors.

9. Blue Buffalo Sensitive Stomach Chicken Recipe Adult Dry Cat Food – Best Gastrointestinal Diet For Cats With Hyperthyroidism 

  •  First 5 Ingredients: Deboned Chicken, Chicken Meal, Brown Rice, Oatmeal, Barley
  •  Guaranteed Analysis: 32% Crude Protein, 16% Crude Fat, 3.5% Crude Fiber, 9% Moisture
  •  Caloric Content: 3,773 kcal/kg
  •  Key Feature: Best gastrointestinal food for hyperthyroid cats    
  •  Type of Product: Sensitive Digestion, No Corn No Wheat No Soy
  •  Life Stage: Adult
  •  Best for: Best for gastrointestinal health in cats with hyperthyroidism

The Blue Buffalo Sensitive Stomach Chicken Recipe Adult Dry Cat Food is perfect for the digestive health of your furry pet. It has a whole mixture of vitamins, antioxidants, and minerals for improving immune health.

Gastrointestinal signs like diarrhea, vomiting and increased stool quantity are common in hyperthyroid cats. You can feed this diet to your pet to reduce the occurrence of the above problems.

It contains deboned chicken, and it gives high-quality protein, which your hyperthyroid feline needs. There are moderate amounts of barley, brown rice, and oatmeal. Besides that, there are a few nutrient-rich veggies, grains, and fruits.

This formula includes FOS prebiotics which is best in promoting healthy digestion. They also help in nutrient absorption. For keeping the coat and skin of your cat healthy, there are omega-3 and omega-6 fatty acids.

10. Merrick Purrfect Bistro Grain-Free Chicken Pate Canned Cat Food – Best Cat Food For Hyperthyroid Picky Eaters 

  •  First 5 Ingredients: Deboned Chicken, Chicken Broth, Chicken Liver, Natural Flavor, Dried Egg Product
  •  Guaranteed Analysis: 10% Crude Protein, 5% Crude Fat, 1% Crude Fiber, 78% Moisture
  •  Caloric Content: 1,132 kcal/kg
  •  Key Feature: Best feline diet for picky eaters with hyperthyroidism
  •  Type of Product: Grain-Free, Gluten-Free, No Corn No Wheat No Soy, High-Protein, Pea-Free
  •  Life Stage: Adult
  •  Best for: Best formula for picky eaters suffering from hyperthyroidism

The Merrick Purrfect Bistro Grain-Free Chicken Pate Canned Cat Food is another high protein recipe on our list. Chicken, which is the first ingredient, is filled in a savory broth. It gives energy and supports the healthy development of muscles.

Feeding essential nutrients are vital for maintaining the health of hyperthyroid cats. However, in case you have a picky eater, you can feed this grain-free diet by Merrick. It is a well-balanced diet for felines and kittens.  

This recipe comes with a targeted mixture of minerals, vitamins, and essential taurine. It is loaded with high antioxidants to support immune health. Besides that, there are omega-3 fatty acids for promoting healthy skin and glossy fur.

It includes yucca schidigera, which allows gentle digestion. Your furry pet would like the taste of this formula, and it has a pate texture. Besides that, it is a pea-free diet and offers complete nutrition daily.

What Factors To Consider While Buying The Best Cat Food For Hyperthyroidism? 

High Protein 

The protein content is crucial while choosing a perfect diet for hyperthyroid cats. One of the typical symptoms of felines suffering from hyperthyroidism is muscle loss.

Protein is the fundamental macronutrient that is crucial for maintaining muscle mass in kitties. A high protein diet is essential to restore and build more muscle tissue in your furry friend. [7]

Low Carbohydrate Diet 

Many hyperthyroid cats have chances of developing subclinical diabetes. The mild hyperglycemia, insulin resistance, and glucose intolerance in cats is the proof for that. Due to this, it is critical to feed a low-carb food with 10% or fewer calories.

No soy diet 

Though soy is a protein and fiber food, it is not safe to feed this to your hyperthyroid kitties. Studies reveal that soy is a common dietary ingredient and raises serum T4 levels in your furry pets. [8] Due to this, avoid all diets that have excess amounts of soy.

Others 

Below are some foods which are better to avoid:

  •  Fish
  •  Excessive and ultra-low iodine formulas
  •  Canned foods with BPA linings
  •  More plant protein instead of animal protein

What Is Hyperthyroidism? 

Hyperthyroidism is a common illness in mature felines. It occurs because of the excess secretion of thyroid hormone, known as thyroxine. The thyroid gland is present in the cat’s neck. It has the responsibility for boosting metabolism in your furry pets. Because of that, one of the early signs of hyperthyroidism is weight change. [9]

Your cat will gain weight if it experiences an underactive thyroid, which happens only in rare situations. If your cat develops an overactive thyroid, it loses weight, which is relatively common. Studies estimate that around 10% of the senior felines have chances of suffering from hyperthyroidism. [10]

In several cases, hyperthyroidism occurs due to the non-cancerous tumor present somewhere in the thyroid gland. But, in rare situations, this tumor can result in thyroid cancer. [11]

Symptoms Of Hyperthyroidism 

In the initial stages, the signs of hyperthyroidism might be similar to a few feline diseases, such as diabetes. Symptoms in your kitties can become worse when this illness progresses. [12]

  •  Weight loss
  •  Increase in appetite
  •  Frequent vomiting
  •  Weakness and depression
  •  More activity and feeling restlessness
  •  Being aggressive and stubborn
  •  Vulnerable hair coat
  •  Increased heartbeat
  •  Matted or oiled hair  
  •  Drinking more water
  •  Urinating more and frequently
  •  Periodic diarrhea or heavy stool quantities
  •  Struggling to breathe [13]

It is crucial to understand that not all felines will show these symptoms. In short, around 20% of cats with hyperthyroidism can become lazy and depressed rather than hyperactive. If hyperthyroidism is left untreated in cats, it might result in severe heart issues. Your furry pet can get hypertrophic cardiomyopathy (thickened, expanded heart) which can be deadly. [14]

Frequently Asked Questions (FAQs) 

What Cat Breeds Are More Vulnerable To Hyperthyroidism? 

Hyperthyroidism can develop in cats of all breeds, mainly as they grow old. There are no certain cat breeds that have more risk of getting hyperthyroidism. However, a few breeds such as Himalayan, Siamese, and Persian felines have fewer chances to experience this disease than others. [15]

What Diseases Are Related To Hyperthyroidism?  

The high levels of thyroid hormone impact metabolism and can affect many other organs in your cat. Here is a brief list of diseases associated with hyperthyroidism.

  •  Thyrotoxic Hypertrophic Cardiomyopathy
  •  Chronic Kidney Disease (CKD)
  •  Inflammatory Bowel Disease (IBD)
  •  Interstitial Cystitis  
  •  Hypertension
  •  Hepatic Lipidosis
  •  Thyrotoxic Liver Disease [16]

Is Hyperthyroidism Common In Young Cats? 

In general, middle-aged or senior cats have high chances of developing hyperthyroidism. The average age of hyperthyroid felines is about 12 years. Besides that, only around 5% of cats less than ten years old have hyperthyroidism. [17]

What Is Felimazole? Is It Beneficial For Treating Hyperthyroidism In Cats? 

Felimazole Coated Tablets is an FDA-approved drug to control hyperthyroidism in felines. It includes one active ingredient, which is methimazole. You can only get the Felimazole drug with a standard veterinarian prescription. [18]

How To Treat Hyperthyroidism In Cats? 

There are four best treatments available for cats with hyperthyroidism. Consulting the veterinarian might be a good idea to know which therapy is ideal for your furry pet. Treatment choices include:

  •  Dietary therapy – Using special diets meant for hyperthyroid cats
  •  Radioactive iodine therapy – Injecting iodine directly into the kitty’s bloodstream
  •  Surgery – Removing thyroid in cats through surgery
  •  Medication – Giving antithyroid drugs two times a day.

Our Verdict 

In general, feeding hyperthyroid felines a similar diet to what they can get in the wild is often better. While choosing the best diet for hyperthyroidism, make sure that it contains at least 50-60% protein, low carb, moderate fat contents.

Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food from this list is our ultimate choice for hyperthyroid kitties. It is a veterinarian formula and is specially made for thyroid problems.

Some foods in this list are veterinary diets. It is mandatory to have a basic prescription from a certified veterinarian to purchase them. In contrast to that, there are several non-prescription recipes. Regardless of whatever you choose, it is critical to contact your veterinarian to know if it is best for your furry pet or not.

Remember that all hyperthyroid felines do not have the exact dietary needs and medical requirements. I think that Hill’s Prescription Diet y/d Thyroid Care with Chicken Canned Cat Food is the best diet to feed cats with hyperthyroidism.