How long for my dog's food allergy symptoms to completely clear up?
Updated On September 23rd, 2025
Pet's info: Dog | Golden Retriever | Female | unspayed | 1 year old | 50 lbs
How long does it take to get an allergen out of their system (food)
2 Answers
Most Helpful Answer
Published on October 17th, 2017
It takes 4-6weeks for allergens to completely leave the skin layers. If persisting longer than this the diet should be reassessed and other triggers such as external allergies, parasites and infections should be investigated
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on August 22nd, 2018
Food allergies can take 8 weeks to see changes. If there was a secondary skin infection this time then you will need antibiotics to clear that as the food won’t treat that. You can do a weekly bath in a medicated shampoo to help also
1Pet Parents found this answer helpful
Health & Wellbeing
A few months ago I was researching dog food allergies and realized Moose has had most of the symptoms; itchy ears, licking his paws, vomiting (almost once a month), and light-ish poop. I switched him to a new food and all these symptoms went away. Th
Food allergies can take 8 weeks to see changes. If there was a secondary skin infection this time then you will need antibiotics to clear that as the food won’t treat that. You can do a weekly bath in a medicated shampoo to help also
Updated on September 24th, 2025
Health & Wellbeing
My Jack Russell started scratching and nibbling his back causing red skin about a month ago then I noticed I had switched his food so I'm thinking he is having a food allergy so I switched back to his regular food about 2 weeks ago and their is a lit
First you have to rule out other things as well like fleas and secondary infection which can both be itchy. If there are any lesions under the skin there may be a secondary infection (common with allergy). For food allergy it can take time for symptoms to resolve (8+ weeks for some dogs) and those pets who are very itchy may need medications to stop the itch (itching can lead to secondary skin infection as well). So if your pup is very itchy you may want to talk to your family vet about meds to help with itch while going back to the old food. And treat for fleas just in case (even if you do not see any). I hope this helps and thank you for using Boop by Petco!
Updated on September 24th, 2025
Health & Wellbeing
My dog has really bad allergies. We went to the vet & decided to do trials with food to see what helps. I bought him a new dog food & about a week later you could tell he was worse, he was itching more, ear infections, rashes, he was allergic to this
It can sometimes take up to two months to fully see results of a new food before any symptoms are completely gone if it is a food-based reaction. I would hesitate to keep switching foods as you won't be able to accurately judge if a food is causing it and may just cause added GI upset on top of the itching and scratching. If Jax is still breaking out very badly it would be best to contact the vet doing the food trial with you so they can take note and make suggestions on whether a change should happen or if you should stay on the food for a while longer.
Updated on September 24th, 2025
Health & Wellbeing
I recently got my dogs allergy results in, and switched her food immediately. It's been two days on the new food, and it seems that her face scratching has gotten worse. I have medications for her, but was told to use it only when needed. Do the al
Allergies would not be expected to get worse during recovery but without full allergy report and food breakdown it is impossible to predict what might be happening. Please feel free to repost again with more information and give her the symptomatic treatment to reduce current discomfort until long term management is achieved
Updated on September 24th, 2025
Health & Wellbeing
Hello so for about 2 months my baby girl Crystal has had these spots in her fur. She sheds a lot and has two sores on her paws. Just recently I found out she has a chicken allergy. So I’ve stopped feeding her chicken but it seems as though she still
It will take about 8 weeks before the skin lesions will heal related to the chicken allergy. You can give her an omega 3 fatty acid supplement which will to maintain better skin health. If her skin does not heal up completely with 2 months or if it gets worse, I recommend to have Crystal examined by the veterinarian to check for other causes of skin lesions. Changing her diet to Royal Canin or Nutro may also help as these diets are good for skin health. Please feel free to post any additional questions.
Updated on September 24th, 2025
Health & Wellbeing
Hello I have a blue nose pitbull he has developed red welps all over. We have tried switching hos food to a non grain food. If it is a food allergy about how long should it take to see improvement?
Food allergies are actually not very common in dogs, and the most common food allergy is protein not grain. I would be more inclined to think that Maximus may be suffering from environmental allergies or may have been bitten by an insect leading to the whelps. If he was suffering from a food allergy, I would expect to see an improvement in his symptoms within a few weeks, but I wouldn't wait and see. I would have Maximus seen by a vet tomorrow for these red whelps. The vet can diagnose the cause of them, and can prescribe a treatment for them.
Updated on September 24th, 2025
Food & Nutrition
Hello. My cat has been pulling his hair off for a long time. He is a house cat, so he does not go outside and hasn't caught any external parasite. Due to this issue, we have changed his diet to Purina's PRO PLAN® VETERINARY DIETS HA HYPOALLERGENIC Fe
That is good that you are looking into food allergy. It is important to rule out all causes of allergies. You should not expect to see any changes in his behavior for AT LEAST 4 weeks minimum. A food trial is a full 16 week event and you will not know the full effects until then. Make sure you are conducting a proper food trial and keep your veterinarian updated. Don't stop the diet without talking with your vet. If Jorge seems uncomfortable, your vet can provide medications to make him feel better. I hope this helps.
Updated on September 24th, 2025
Health & Wellbeing
I got a new dog on 2/16/17 and he was very itchy and sneezed a lot when I got him. I treated him for fleas and changed his food from Alpo to Premium Edge Lamb food for the past week. I took him to the vet two weeks ago and nothing unusual came up. He
It sounds as though you are doing everything right! It can take 2-3 months for a diet change to take full effect in the case of food allergies. During that time, it may be helpful to consider prescription based anti-itch medications if the Benadryl proves ineffective. As your vet mentioned, Benadryl is certainly the first line of defense. If the Benadryl doesn't help his itching after a few days of use, give your vet a call for a recheck. Be sure to keep Harry on a high quality flea preventative, such as Nexgard, Bravecto, or Advantix on a monthly basis.
Updated on September 24th, 2025
Food & Nutrition
I just switched my 'itchy' dog to a grain-free diet. How long before she gets some relief?
One important fact to remember is that grains are very rarely the cause of any allergies in pets. Additionally, grain free diets have been linked to heart disease though it is not fully understood at this time. If Stella does respond, it will be 12-16 weeks before you will know if it helped or not. Additionally, she cannot have any other treats/foods/flavored supplements during this trial period. The best way to rule out a food allergy is with a hydrolyzed protein diet. I hope this helps and please feel free to post any additional questions.
Updated on September 24th, 2025
Health & Wellbeing
We have tried changing to two different dog foods for skin sensitivities and or allergies. We have tried walking daily and putting him on trazadone but nothing changed. This started in late December and we have had him testes for mites, ring worms, f
A food elimination trial should last a minimum of 6-8 weeks feeding one food exclusively, no other treats or foods. Afterwards, the condition should be reassessed. If this is the case with two different diets containing a novel protein/carb combo and still no improvement, then a consultation and exam with a veterinary dermatologist may be your next step. If Samson is licking or chewing excessively, an e-collar (cone) should be used. Consider an essential fatty acid supplement, such as DermCaps or EicosaCaps, to promote healthy skin and coat. If allergies are the underlying cause, they can be frustrating to diagnose, but once you determine specific allergens then management may be easier.
Updated on September 24th, 2025
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