My dog is itchy. Is it food allergy or environmental allergy?

I'd have Mushu seen by a vet. Typically environmental allergies are much more common than food allergies (only 10% of dogs with allergies have a food allergy), but the vet can run tests and may suggest a diet trial to diagnose what is going on. I hope this helps!

Thanks for using Petco Pet Education Center, formerly Petcoach! This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. This could be either environmental or food related. Unfortunately, it is not specific to any of those possibilities. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

It looks as if your dog has a skin infection, most commonly caused by an allergy, a skin mite (Demodex) or fleas. 

The allergy could be a due to a protein in your dog’s food or an environmental allergy like to dust, pollens, grasses, etc. 

The allergy causes your dog to itch and chew at the skin which breaks down the skin barrier. This then leads to infection. Skin infections are typically characterized by large areas of hair loss, redness, crusting, flaking, and pustules. A thorough skin examination by your veterinarian should be able to determine the cause of the itch so it can be treated appropriately. Your dog will most likely need antibiotics to help clear up the infection and possibly an allergy/anti-itch medication like Apoquel, Atopica, or Cytopoint to give some relief while the infection clears up. A medicated shampoo may be beneficial as well. I would also recommend he be on a good flea control routinely too. Once the infection has resolved a long term allergy medication (like Apoquel or Cytopoint) can be given on a regular basis to prevent any future problems. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.


Allergies can be frustrating to diagnose and treat, for the pet, the pet owner, and the veterinarian! It is the most common cause for itching in dogs. Medications like Apoquel can eliminate the itch due to allergies, though it won't work if there is a secondary bacterial or yeast infection. Food allergies won't be treated simply by a better diet, they need to be strictly on a prescription hypoallergenic diet without other dog or human treats, and even then it can take 3-6 weeks to see positive effects. Until then, anti-itch medications, steroids, or shampoos/topical mousses can be used to minimize the itch and treat any present infection. I would recommend continuing to work with your vet to find the best solution to Toes's itch issue.

If he scratches and is itchy year round, it could be a food allergy or an indoor allergen. Discuss desensitization injections (allergy shots), hydrolyzed diets, antihistamine use and food elimination trials with your veterinarian. https://www.petcoach.co/article/food-trials-for-allergies-in-pets-what-to-expect https://www.petcoach.co/article/what-is-a-novel-protein-pet-food/ https://www.petcoach.co/dog/condition/food-allergies/

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 Petco Pet Education Center, formerly Petcoach!

Allergies are common in dogs. Sometimes controlling one allergy, such as food, can make the other is more manageable. This means by putting a dog that's allergic to both food and environmental allergens on a special diet to control the food allergy can make them less reactive to environmental allergies. You could discuss with your veterinarian doing a food trial for your dog or medications to control allergies such as Apoquel, Atopica, or even steroids. I am not sure which of those medications are approved for use in your country.