First Walk is on Us!

✓ GPS tracked walks
✓ Activity reports
✓ On-demand walkers
Book FREE Walk

Jump to Section

What is Tuna Allergy?

Just like humans, our cats can have allergies to certain foods or specific ingredients.  If exposed to a food allergen, it typically presents as a skin issue.  It can start out small as simply itching or licking excessively, but then turn into your cat losing all his fur in response to constantly scratching.  Or maybe his stomach seems upset after eating or he has been consistently losing weight despite a healthy appetite.  All of these things can be indicative of a food allergy.  If this sounds like your cat, you can discuss diagnostic and treatment options with your veterinarian. Once the allergen causing food is removed from his diet, his symptoms should subside and he should have a good prognosis of recovery.

While we have been taught cats love fish, tuna is not the best one for him.  If you feed your cat tuna on a regular basis, discuss possible side effects with your veterinarian.

Symptoms of Tuna Allergy in Cats

Symptoms may include:

  • Alopecia
  • Pruritus (head, neck, ears)
  • Erythema
  • Papules
  • Dermatitis
  • Granulomas 
  • Indolent ulcers
  • Weight loss
  • Vomiting 
  • Diarrhea
  • Abdominal pain
  • Flatulence
  • Inflammatory bowel disease
  • Rhinitis
  • Conjunctivitis
  • Pancreas problems
  • Liver problems
  • Kidney problems 


Allergies in our pets are usually caused by one of three things: food, the environment, or fleas.  If your cat has an allergy to something in the environment, it can be almost anything.  He can be allergic to pollen, dust, cedar, and even you.  If he is allergic to fleas, he can have a severe dermatologic reaction to just one single flea bite.  If he has a food allergy, it means something he is eating his symptoms.  A food allergy does not necessarily have a predisposition behind it.  It can occur at any age, to any breed or sex, and to any ingredient.

Causes of Tuna Allergy in Cats

People often think human-grade tuna is good for their cat when in reality it is lacking important nutrients cats need in their diet. An allergy to tuna can be indicative of a type of food allergy.  A food allergy is caused by a hypersensitivity reaction to a food ingredient or additive.  Just like with any type of allergy in general, it is the immune system thinking something harmless is actually dangerous.  In this case, your cat’s system thinks the tuna is a threat and therefore the body responds in an attempt to protect itself.

Diagnosis of Tuna Allergy in Cats

Your veterinarian will perform a full physical exam on your cat.  This will allow her to take a proper look at his symptoms and rule out possible causes of his condition based on his symptoms.  She will also collect a verbal history from you.  She will want to know when his symptoms started, if they have been progressing, if you have been trying to treat at home with over the counter products and so on.  All these details can help the veterinarian with her diagnosis.

Naturally, the veterinarian will need to rule out other possible causes of his symptoms such as gastrointestinal parasites or flea bite hypersensitivity.  These things can also cause the skin and gastrointestinal symptoms so your veterinarian may run some basic diagnostic testing to rule out other suspected issues.  A fecal test will be recommended to check for intestinal parasites and possible skin diagnostics such as a cytology or skin scrape to rule out dermatological related causes.

Unfortunately there is no serum, blood, or intradermal test reliable for diagnosing food allergies.  The main way to come to a proper diagnosis is a trial and error dietary study; it is known as an elimination diet trial.  You remove tuna from his diet for a minimum of 12 weeks.  This gives his system time to remove any remaining ingredient from his system completely and hopefully his symptoms will begin to resolve.  Gastrointestinal signs typically resolve between 1 to 3 weeks.  Dermatologic symptoms take much longer to resolve as it takes the skin time to heal.  If his symptoms have resolved during this time, you need to reintroduce the suspected food item to get a confirmation.  If you offer the tuna to your cat again and his symptoms reappear almost immediately, you have your culprit.

Your veterinarian will also recommend blood work to check organ function.  If she believes tuna is the cause, she will want to evaluate the kidney and liver function with a chemistry panel.  She will also want to evaluate the pancreas levels with a specific test to see if pancreatitis is a secondary issue.

Treatment of Tuna Allergy in Cats

There is no treatment for a food allergy.  Instead, the veterinarian can offer secondary treatment to relieve your pet’s symptoms.  If he is experiencing pruritus and skin infection she may prescribe medications such as glucocorticoids or antihistamines to help with the itching and inflammation. She may also recommend a topical medication in the form of a liquid, ointment, or spray for you to apply directly to the lesions themselves

If your cat is experiencing any gastrointestinal upset from the tuna, your veterinarian can offer medications and therapies for it as well.  There are anti-vomiting medications, anti-diarrheal, and medications to calm the GI tract she can administer to your cat.  His symptoms will determine his treatment protocol.

If he has pancreatitis, there are specific medications she will prescribe to address it.  Depending on the severity of his condition, he may need to be hospitalized for therapies and monitoring.  If he is experiencing any type of liver or kidney issues or failure, it will also require treatment and possibly hospitalization.

Finding the source of your cat’s allergy is ideal.  By determining it is the tuna causing your cat’s symptoms, you can remove it from his diet and prevent his symptoms from continuing.

Recovery of Tuna Allergy in Cats

The severity of your cat’s symptoms will determine his recovery.  If he is experiencing mild gastrointestinal symptoms and skin related symptoms, he should recover very well with proper treatment.  If he developed pancreatitis, liver failure, or kidney failure, his prognosis of recovery declined.  The wisest thing you can do is talk to your veterinarian about your cat’s diet before you offer him any type of human food.

Tuna Allergy Questions and Advice from Veterinary Professionals

Domestate short hair
10 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms


My cat tiger has experience now playing not meowing.not eating.i took to doctor and he was given amoxicillin.bur I always have him tuna with his crunchy food Purina.. but I just took him back because his symptoms are back he had bacterial infection and no were high.. he has been given sensitive stomach Purina and two antibiotics flagyl and unrinary tract antibiotics. And I stopped giving him tuna.i didn't know tuna was harmful. Can he get better with this. I'm Force feeding him diet food. He does not like chicken flavor he never have. He just wants water.. doctor gave him b12 shot also flagyl twice a day. Other once a day. And appetite booster

Add a comment to Tiger's experience

Was this experience helpful?

Tabby Cat
1 Year
Mild condition
0 found helpful
Mild condition

Has Symptoms

Super hyper.

I have my cat a tea spoon on caned tuna. He went from super calm to super hyper. (Running around the room, sliding on hard wood floors, attacking bags, jumping randomly in the air. Etc)

Is this normal? If so why?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
I’ve read about some cats becoming hyper after eating canned tuna, not sure why it occurs though if it was fed only once. If Booker continues to be hyper you should visit your Veterinarian for an examination to see if anything else is going on. Regards Dr Callum Turner DVM

Add a comment to Booker's experience

Was this experience helpful?

2 years
Mild condition
1 found helpful
Mild condition

Why is my cat breathing as if he has a stuffy nose? He's also lost a lot of weight, and won't eat anything. I fed him tuna a few days ago, he ate a little bit but stopped eating it after a few bites. He hasn't ate anything else since.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
Tuna allergies in cats may cause inflammation of the nasal cavity which can cause secretions and reduction in airflow. Normally allergies to tuna and other fish manifest themselves as skin irritation or gastrointestinal symptoms but may cause other problems. I would visit your Veterinarian to check Arrow over to make sure that there isn’t anything else which may be causing these symptoms. Regards Dr Callum Turner DVM

I feed her a can tuna w water in the tune and she was fine till bout 11pm when she looked like went into a seziure and now it can hardly walk keep falling over and head bounce back n forth what can I do

Is there any way you could possibly tell me what could be the problem? All I know is that he won't eat, or drink anything. He has lost he meow. When you put food in front of him, he looks at it as if he wants it, but won't eat it. He walks fine, but he would rather sit or lay down.

Add a comment to Arrow's experience

Was this experience helpful?

1 Year
Mild condition
0 found helpful
Mild condition

Has Symptoms

Vomiting Diarrhea and sleeps a lot

I changed the dry food to Meo tuna dry food and my cat doesn't like it. He puked the food that I gave him and has Diarrhea. What is the solution to this problem?

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
If Ellie has developed diarrhea and vomiting from the food change, the problem may resolve by changing the food back. If he has vomited more than once, or has had diarrhea for more than 24 hours, it would be best to have him seen by a veterinarian, as he may need medications to settle his stomach, or fluids if he is getting dehydrated.

Add a comment to Ellie's experience

Was this experience helpful?