What are Fish Allergies?
Dog food companies are constantly producing new flavors of dog food. One thing that doesn’t change as frequently, however, is the main protein source within the food. Many dogs are sensitive or 'allergic' to beef and chicken which results in owners serving their dog a food with fish as the main protein source instead. Since more dogs are receiving fish in their diets, it is only the natural progression of things that more and more dogs are being diagnosed with an allergy to fish. It is still rare to have a dog with a fish allergy, but it is becoming more common by the day. If your dog has ongoing vomiting and diarrhoea, or is constantly scratching, licking, or getting an ear infection repeatedly, you might want to consider the possibility of it being caused by a food allergy. If it is discovered fish is the culprit, as soon as you remove it from your dog’s diet, he should recover very smoothly and all symptoms of allergies should stop once it is out of his system. Keep in mind though, that many dogs with food sensitivities are sensitive to more than one ingredient. Similarly, these dogs are more prone to environmental allergies, so it is common for some symptoms to persist, even if they improve with diet modification.
Many dog foods have fish as their main protein source or as an ingredient of some sort. If you have your dog on a diet containing fish and he is acting abnormally or suffering allergy-like symptoms, be sure to consult with your veterinarian.
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Symptoms of Fish Allergies in Dogs
Symptoms of fish allergies in dogs may appear quickly once he starts eating a diet consisting of it, but in other cases the allergy may take months or years to develop. Allergies typically present between the ages of 1 and 5. Symptoms of fish allergies may include
- Itchy skin
- Skin infection
- Ear infection
- Obsessive chewing/licking of feet
- Loss of fur
- Vomiting
- Diarrhea
- Hives, swelling or anaphylactic shock. These would occur with an IgE mediated allergies, which are much less common than sensitivities)
A life-threatening allergic reaction such as anaphylactic shock is rare but possible. If the allergy is severe enough, your dog will go into anaphylactic shock immediately after ingestion. If this happens, it is a medical emergency and your dog needs to be seen by a veterinarian immediately.
Types
The terms ‘fish’ and ‘fish derivatives’ found on dog food labels are very broad. These terms come with a lot of criticism, but it does not mean that the quality is bad. The terms can vary due to certain countries having laws and customs that may not allow something more specific.
In other cases, using a broad term allows the species of fish in the food to be altered without having to change the bag. As seasons change and overfishing occurs, dog food companies may change the species of fish they are using in their food, but since it is listed as ‘fish’ they do not have to change the bag.
Causes of Fish Allergies in Dogs
If your dog has allergies, it is his body’s way of protecting itself from something it thinks will harm it. While the item in question is actually harmless, the body doesn’t recognize it as such. The body finds it dangerous and mounts a protective response to the threat. Your dog’s body produces an immune response to the fish ingredient. This allergic response may develop quickly or may develop over a period of years. Many food-related allergies happen after the dog suffers from an infection involving the stomach or intestines.
Since many dogs have allergies to other protein sources such as beef and chicken, fish is becoming one of the more popular protein sources in dog foods. As a result, more dogs are developing an allergy to fish which means one less protein source you can safely feed your dog. However, there are some foods that specify the species of fish they are using. By feeding your dog one of these foods, you know exactly what you are feeding him, and if he develops an allergy to one specific fish, you can potentially try him on another. Take note; If sensitive to one type, it is not uncommon to be sensitive to all types. Those with food allergies tend to benefit most from a hypoallergenic diet.
Diagnosis of Fish Allergies in Dogs
Intradermal skin testing for food allergies may not give an accurate diagnosis in every dog. This test can give false positive and false negative results. In a false positive situation, despite the fact the dog is not allergic to the food when ingested, it results in a positive allergic skin response. As for a false negative, some food allergies produce a delayed result of a positive allergic reaction. This causes the veterinarian to believe your dog is not allergic to the allergen since she didn’t see a skin response, but in reality, he is allergic to it.
Serology can be run to check for antibody levels. As with intradermal testing, results aren't always accurate but it can be helpful.
Bicom testing is an unproven method that claims to be able to detect allergies, which you may have heard of. Bicom testing is also known as bioresonance. This method believes every being and substance in the world emits its own electromagnetic wave. The veterinarian takes a blood sample from your dog and tests different food items and substances to see if it has a ‘good’, ‘neutral’ or ‘bad’ response. If the response is ‘bad’, the item being tested causes your dog’s blood wavelength to become stressed. Stressed blood leads to a stressed body and therefore an allergic reaction. If the response is ‘good’, then the item puts out a wavelength that is compatible with your dog’s blood which means no adverse reactions should occur. If it is ‘neutral’, the item being tested does not put out a wavelength that alters that of your dog. Most vets will not offer this service as there is no data which backs it up.
A dietary trial is the most frequently used method of diagnosis. In a dietary trial, you have to feed your dog a novel diet, meaning you feed him a diet without any fish ingredients whatsoever. During this trial, you cannot give any type of treats containing fish or fish flavored medications as it can affect the results. You have to feed your dog the novel diet for at least 90 days before you can get a reliable diagnostic. After the 90 days, if resolution of the allergic symptoms occurs, you then must reintroduce fish to his diet. If a relapse in allergy symptoms occurs once the fish is reintroduced, then you know the source. If symptoms do not return with the reintroduction of fish, then it was a source other than the fish your dog was reacting to.
Treatment of Fish Allergies in Dogs
Strict control of the diet is the best treatment of fish related allergies. It can be a long, discouraging process, but once you discover the source of allergen and are able to successfully remove it from his diet, you and your dog will both be better off. Removing fish completely will also help avoid chronic infections. If the allergen remains in your dog’s food, it will continue to weaken his immune system over time. This leads to long-term and recurring issues. Not only will you both be miserable, but it may also result in much additional veterinary care expense.
As a fish allergy alone is rare and most dogs are allergic to several foods, a hydrolysed diet is the best one to trial. Proteins are broken down and animals do not react to food given in this manner.
Some veterinarians will prescribe a medication to help with the itching your dog may be suffering from. This medication will help for a while, but in reality it is only masking the symptom, not curing it. If you do not remove the source of the itching, you will have to continue to give the prescription and possibly continuously increase the dose as time goes on. If your dog has a more serious reaction to the fish, such as respiratory issues or anaphylactic shock, seek veterinary care immediately.
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Recovery of Fish Allergies in Dogs
Once you remove fish from your dog’s diet, the symptoms should subside in time. It may be several weeks before you see any serious improvements. If your dog has a serious reaction, such as anaphylactic shock, the sooner you seek veterinary care, the better off he will be. If you do not get him veterinary care, he may die.
Since fish is still considered a ‘new’ protein source, not many dogs are allergic to it yet. If you suspect your dog is one of the few allergic to it, discuss it with your veterinarian. The two of you will come up with a diet plan suitable to your lifestyle and his dietary needs.
Fish Allergies Average Cost
From 375 quotes ranging from $500 - $1,032
Average Cost
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Fish Allergies Questions and Advice from Veterinary Professionals
schnauzer/terrier mix
7 years
6 found this helpful
6 found this helpful
My pet has the following symptoms:
Painful Urination
My dog is allergic to 16 foods, among them "Fish Mix (F10)." She eats a hydrolyzed dry food and tolerates it well, and I was thinking of giving her the counterpart (same name, same manufacturer, for the same condition) but in the wet food, only the wet food has fish oil. Could I give her the wet food?
Sept. 26, 2020
Answered by Dr. Michele K. DVM
6 Recommendations
Thank you for your question. I apologize for the delay, this venue is not set up for urgent emails.
I would be very hesitant to give her the canned form if it has fish oil in it - many of these proteins can cross react, and she seems to be doing well on the dry form.
Oct. 15, 2020
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Yorkshire Terrier
Eight Years
0 found this helpful
0 found this helpful
My pet has the following symptoms:
Skin Decease
Hi, Can my dog eat fish, he has a skin decease, or what table foods can he eat?
thanks..
Sept. 26, 2020
Answered by Dr. Michele K. DVM
0 Recommendations
Thank you for your question. I apologize for the delay, this venue is not set up for urgent emails.
With out knowing what is wrong with your dog, I don't know if fish will affect him badly. It would be best to have your pet seen by a veterinarian, as they can examine them, see what might be going on, and get treatment for them.
Oct. 16, 2020
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Chihuahua
Four Years
7 found this helpful
7 found this helpful
My pet has the following symptoms:
Redness
I tried a new fish dog food for my dog last night, within the next 2 hours her eyes were swollen and red. I gave her a bath and put the dog food up and gave her a tiny bit of benadryl to help with the swelling. This morning, the swelling went down in her eye and now her belly is red and she's itching. How long will it take to get out of her system?
Aug. 19, 2020
Answered by Jessica N. DVM
7 Recommendations
Thank you for your question. A reaction to food can take up to a few weeks to have symptoms resolve. She can have 1 mgs/lb of benedryl safely so if she is 10 lbs she can have 10 mgs. You can give it up to every 8 hours. It could also be something in the environment that triggered the allergic reaction. If she is not improving in 24 hours and is uncomfortable I would recommend taking her to your veterinarian so he or she can prescribe medication to help with the itchiness and redness of the skin. I hope she feels better soon.
Aug. 19, 2020
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Chihuahua
Four Years
2 found this helpful
2 found this helpful
My pet has the following symptoms:
Redness
I tried a new fish dog food for my dog last night, within the next 2 hours her eyes were swollen and red. I gave her a bath and put the dog food up and gave her a tiny bit of benadryl to help with the swelling. This morning, the swelling went down in her eye and now her belly is red and she's itching. How long will it take to get out of her system?
Aug. 19, 2020
Answered by Jessica N. DVM
2 Recommendations
Hello-
Thank you for your question. A reaction to food can take up to a few weeks to have symptoms resolve. She can have 1 mgs/lb of benedryl safely so if she is 10 lbs she can have 10 mgs. You can give it up to every 8 hours. It could also be something in the environment that triggered the allergic reaction. If she is not improving in 24 hours and is uncomfortable, I would recommend taking her to your veterinarian so he or she can prescribe medication to help with the itchiness and redness of the skin. I hope she feels better soon.
Aug. 19, 2020
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Goldendoodle
Two Years
1 found this helpful
1 found this helpful
My pet has the following symptoms:
Vomiting
My 2-year old male goldendoodle is regurgitating/vomiting after eating his food. He eats chicken flavored dry food as well as chicken and rice pate. He has issues with salmon.
July 24, 2020
Answered by Dr. Sara O. DVM
1 Recommendations
Hello,
If your dog is eating his food very quickly this may be what is causing him to vomit. You can try using a busy bowl to slow him down. If this continues, it would be best for your vet to look at him and make sure that there is nothing wrong with him.
July 24, 2020
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Pit bull
Bluebaby
7 Years
0 found this helpful
0 found this helpful
My pet has the following symptoms:
Seizures
Licks His Paws A Lot
MY dog (bluebaby) has been having seizures since the summer of 2016 when I moved to a different house and a house that I had restored. Could not find a cause and the vet started him on phenobarb with some control. Few years later, I recently took him to another Vet, who drew some labs which showed hypothyroid an also gave him meds to remove impurities from his system. Because I was not sure if he had been exposed to round up. After discussion and I said that he tends to have tremors in his muscles at times. Then it was thought his calcium may have been low in his tissue/muscles though his serum calcium was fine. We started calcium treatment and I saw an immediate change in his seizures which made them lighter and decrease frequency but still present. She decided to increase calcium from 1 tab twice daily to 2 tabs twice daily and then she wanted me to start him on fish oil to assist the transfer of the calcium to tissues. However, after 2nd dose of fish oil, he had a very violent seizure and I felt like the fish oil was a problem. The vet felt like the fish oil should not be a problem, but I said I was not giving him any more. However I recently started using fish oil for my other dog for itchy skin, which made any immediate difference. But then my other Bluebaby will try to eat Reese's food laced with the fish oil and he will have a seizure. I finally just realized that the dog food that I use is salmon and potatoes and I am thinking he may just be allergic to the dog food also. I am going to change to just beef or something and see if I notice a difference. They have been eating salmon and potatoes forever even before I moved. Can you give me your thoughts.
Fish Allergies Average Cost
From 375 quotes ranging from $500 - $1,032
Average Cost
$1,520
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Easily compare quotes from the most trusted pet insurance companies in the United States.
